Some fragments that change the active structure of drug molecules, like mechanical parts, can be installed on the drug molecule skeleton to improve the drug activity and reduce side effects.
2-Chloro-1-methylpyridinium p-toluenosulfonate
CAS RN
7403-46-5
Appearance
White to almost white crystals
Purity
98% HPLC
4-(TRIFLUOROMETHYL)BENZOIC ANHYDRIDE
CAS RN
25753-16-6
Appearance
Off-white to white crystalline powder
Purity
≥98.0% GC
5,7-Dichloropyrazolo[1,5-a]pyrimidine
CAS RN
57489-77-7
Appearance
Pale yellow to white solid powder
Purity
98% HPLC
Di-tert-butyl N,N-diethylphosphoramidite
CAS RN
117924-33-1
Appearance
Yellow liquid
Purity
98% GC
METHYL 1-BENZYL-4-OXOPYRROLIDINE-3-CARBOXYLATE
CAS RN
329956-53-8
Appearance
Pale yellow viscous liquid
Purity
>95% HNMR
Methyl 1-methylpiperidine-4-carboxylate
CAS RN
1690-75-1
Appearance
Light yellow liquid
Purity
98% GC
CAS RN
101385-93-7
Appearance
White to off white powder
Purity
99% GC
O-(2,4-dinitrophenyl)hydroxylamine
CAS RN
33543-55-4
Appearance
White to off white solid
Purity
99% HPLC
(S)-2-(tert-butoxycarbonyl)pent-4-enoic acid...
CAS RN
221352-64-3
Appearance
White to off white solid
Purity
>97%
4-Hydroxy-6-(trifluoromethyl)pyrimidine
CAS RN
1546-78-7
Appearance
White solid
Purity
>98% HPLC
N-(2-Aminoethyl)maleimid trifluoroacetate salt
CAS RN
146474-00-2
Appearance
Off white solid
Purity
95% HPLC
N-Cbz-piperidine-2-carboxylic acid
CAS RN
84358-13-4
Appearance
White crystalline powder
Purity
98% HPLC
N-Cbz-piperidine-2-carboxylic acid
CAS RN
84358-13-4
Appearance
White crystalline powder
Purity
98% HPLC
CAS RN
18704-37-5
Appearance
Off white or white crystals
Purity
98%HPLC
O-ButylhydroxylaMine Hydrochloride
CAS RN
4490-82-8
Appearance
White crystalline powder
Purity
98 %-103%(AT)
2,6-Dihydro-4H-pyrrolo[3,4-c]pyrazole-5-carboxylic acid...
CAS RN
1280210-79-8
Appearance
Light yellow to yellow powder
Purity
≥98% HPLC
2-(3-CHLOROPROPYL)-2,5,5-TRIMETHYL-[1,3]-DIOXANE
CAS RN
88128-57-8
Appearance
Purity
≥98%
2-Bromo-5-fluoropyridine 1-oxide
CAS RN
935534-39-7
Appearance
Light yellow to almost white solid
Purity
≥98.0%
CAS RN
22385-77-9
Appearance
White crystal
Purity
99% GC
6-Chloropyrimidine-2,4-diamine
CAS RN
156-83-2
Appearance
Off white solid powder
Purity
98%
CAS RN
142356-33-0
Appearance
Colorless to light yellow transparent liquid
Purity
≥97% GC
N-Boc-N-methoxy-3-aminopropionic acid
CAS RN
172299-81-9
Appearance
Colorless Transparent Liquid
Purity
98% HNMR
O-Acetyl-N-tert-butylhydroxylamine Hydrochloride
CAS RN
851074-40-3
Appearance
White crystalline powder
Purity
98%-103%(T); 97% HPLC
CAS RN
24807-55-4
Appearance
White to yellowish crystalline powder
Purity
98% HPLC
CAS RN
1670-14-0
Appearance
White crystalline powder
Purity
≥98.0% HPLC
CAS RN
185456-26-2
Appearance
White to off white solid
Purity
MPCN 4-Methoxy-2-oxo-1,2-dihydro-pyridine-3-carbonitrile
CAS RN
21642-98-8
Appearance
Pale yellow crystalline powder
Purity
≥99%HPLC
N-(4-Pyridyl)pyridinium chloride hydrochloride
CAS RN
5421-92-1
Appearance
Pale yellow solid
Purity
98%HPLC
CAS RN
301673-14-3
Appearance
White powder
Purity
Nuclear magnetic resonance qualified
CAS RN
22509-74-6
Appearance
Off white to white crystalline powder
Purity
97% HPLC
CAS RN
20845-34-5
Appearance
Light yellow liquid
Purity
97% GC
O-tert-butylhydroxylamine hydrochloride
CAS RN
39684-28-1
Appearance
Off white to light pink solid
Purity
98% T
CAS RN
4792-15-8
Appearance
Pale yellow to colorless transparent liquid
Purity
≥98%
CAS RN
1001067-09-9
Appearance
White to off white solid powder
Purity
98.0% HPLC/T
2-Amidinopyrimidine hydrochloride
CAS RN
138588-40-6
Appearance
Yellow green solid
Purity
98%HPLC
2-Amino-1,3-thiazole-4-carboxylate
CAS RN
118452-04-3
Appearance
Off yellow to white powder
Purity
98% HPLC
2-Bromo-1,3,5-triisopropylbenzene
CAS RN
21524-34-5
Appearance
Colorless to yellowish liquid
Purity
97% GC
CAS RN
144564-95-4
Appearance
White to off white powder
Purity
98% HPLC
Ethyl N-Boc-piperidine-4-carboxylate
CAS RN
142851-03-4
Appearance
Light yellow liquid
Purity
97% GC
Ethyl2-chloropyrimidine-5-carboxylate
CAS RN
89793-12-4
Appearance
Off-white to white solid
Purity
>98% HPLC
CAS RN
89180-61-0
Appearance
Pale yellow to colorless transparent liquid
Purity
97% HPLC
N-(TERT-BUTYL)-2-CHLOROACETAMIDE
CAS RN
15678-99-6
Appearance
White to almost white crystalline powder
Purity
≥98% HPLC
N-Boc-Bn Tert-butyl n-(benzyloxy)carbamate
CAS RN
79722-21-7
Appearance
White to off white solid
Purity
98%HPLC
N-boc-ethylenediamine hydrochloride
CAS RN
79513-35-2
Appearance
White powder
Purity
98 %-103%(AT)
Tetraisopropylazodicarboxamide
CAS RN
155877-06-8
Appearance
Yellow solid
Purity
99%HPLC
9-Fluorenylmethyl N-hydroxycarbamate
CAS RN
190656-01-0
Appearance
White to off white solid
Purity
98% HPLC
N-(tert-Butoxycarbonyloxy)phthalimide
CAS RN
15263-20-4
Appearance
White to off white solid
Purity
≥95% HPLC
CAS RN
7689-50-1
Appearance
White crystalline powder
Purity
98%HPLC
CAS RN
23135-50-4
Appearance
White to off white powder
Purity
>99%
CAS RN
71195-85-2
Appearance
Colorless to yellowish liquid
Purity
98%GC
CAS RN
39546-32-2
Appearance
White or almost white crystalline powder
Purity
98% HPLC
2-Aminoethanesulphonamide monohydrochloride
CAS RN
89756-60-5
Appearance
White crystalline powder
Purity
97%-102%(T)
CAS RN
773-64-8
Appearance
White crystalline powder
Purity
98% HPLC
3-(tert-Butoxycarbonylamino)propyl bromide
CAS RN
83948-53-2
Appearance
White to off-white powder
Purity
≥98.0% GC
CAS RN
2353-44-8
Appearance
Blue solid
Purity
HNMR qualified
CAS RN
17696-11-6
Appearance
Pale yellow to off white solid or transparent liquid
Purity
>97.0%(GC)
Mesitylenesulfonic acid dihydrate
CAS RN
835617-36-2
Appearance
White crystalline powder
Purity
98% HPLC
N,N'-Bis(tert-butoxycarbonyl)guanidine
CAS RN
154476-57-0
Appearance
White powder
Purity
98% HPLC
CAS RN
14997-58-1
Appearance
White powder
Purity
98.5% HPLC; 98.5% T
palmitic acid N-succinimide ester
CAS RN
14464-31-4
Appearance
White solid
Purity
Conform to the nuclear magnetic spectrum
Terephthalimidamidedihydrochloride
CAS RN
14401-56-0
Appearance
Off white to white solid powder
Purity
>98% HPLC
CAS RN
15115-60-3
Appearance
White to off white solid
Purity
≥ 98%HPLC
Ethyl N-Cbz-4-Oxopyrrolidine-3-carboxylate
CAS RN
51814-19-8
Appearance
Off white to white powder
Purity
98% HPLC
methyl 2-aminopent-4-enoate hydrogen chloride
CAS RN
115289-55-9
Appearance
Yellow viscous liquid
Purity
>97%
N-(Diphenylmethylene)glycine ethyl ester
CAS RN
69555-14-2
Appearance
Off white to white powder
Purity
98% HPLC
1,1,1,3,3,3-Hexafluoro-2-propanol
CAS RN
920-66-1
Appearance
Colorless Transparent Liquid
Purity
98% GC
2-(bis(2-hydroxyethyl)amino)acetic acid
CAS RN
150-25-4
Appearance
Off white solid
Purity
CAS RN
133975-85-6
Appearance
Colorless viscous liquid
Purity
>98%
CAS RN
16064-24-7
Appearance
Off white to white solid powder
Purity
>98% HPLC
DMEAD, Bis(2-methoxyethyl) diazene-1,2-dicarboxylate
CAS RN
940868-64-4
Appearance
Yellow Powder
Purity
≥98% HPLC
Methyl 4-aminobutyrate hydrochloride
CAS RN
13031-60-2
Appearance
White solid
Purity
≥98%(AT)
N-(4-Chloro-7H-pyrrolo[2,3-d]pyrimidin-2-yl)-2,2-dimethylpro...
CAS RN
149765-15-1
Appearance
Powder grey crystalline powder
Purity
>98 HPLC
N-(tert-Butoxycarbonyl)-1,2-phenylenediamine
CAS RN
146651-75-4
Appearance
Orange solid
Purity
98% HPLC
CAS RN
146651-71-0
Appearance
Off white to white solid powder
Purity
>97% HPLC
Suberate Bis(sulfosuccinimidyl) Sodium Salt
CAS RN
127634-19-9
Appearance
White solid
Purity
HNMR>90%
4-Methylbenzene-1-carboximidamide hydrochloride
CAS RN
6326-27-8
Appearance
White powder
Purity
98% HPLC
Benzyl N-(hydrazinylmethylidene)carbamate
CAS RN
16706-54-0
Appearance
White crystalline powder
Purity
>98%HPLC
CAS RN
2404-75-3
Appearance
colorless liquid
Purity
>99% GC
N,N'-Di-tert-butoxycarbonyl-L-histidine
CAS RN
20866-46-0
Appearance
White solid
Purity
N-(Benzyloxycarbonyl)-2-aminoacetonitrile
CAS RN
3589-41-1
Appearance
Pale yellow to white solid powder
Purity
98% HPLC
CAS RN
71999-74-1
Appearance
Light yellow to colorless transparent liquid or solid
Purity
≥98% GC
CAS RN
116574-71-1
Appearance
White to almost white crystalline powder
Purity
97% HPLC
CAS RN
51354-15-5
Appearance
Colorless Transparent Liquid
Purity
>98.0% GC
N-Isopropylhydroxylamine hydrochloride
CAS RN
50632-53-6
Appearance
White crystalline powder
Purity
97%AT
CAS RN
4144-22-3
Appearance
Pale yellow to colorless transparent liquid
Purity
98.0%(GC)
2-Methylpropylhydrazine hydrochloride
CAS RN
237064-47-0
Appearance
White solid
Purity
98%-103% T
3-Chlor-Benzamidine hydrochloride
CAS RN
24095-60-1
Appearance
White crystalline powder
Purity
98% HPLC
CAS RN
89102-73-8
Appearance
Pale yellow to colorless transparent liquid
Purity
97% HPLC
CAS RN
16375-88-5
Appearance
Off white solid
Purity
99% HPLC
4-Chlorobenzene-1-carboximidamide hydrochloride
CAS RN
14401-51-5
Appearance
White crystal
Purity
98%HPLC
4-Fluorophenylhydrazine hydrochloride
CAS RN
823-85-8
Appearance
White to off white solid
Purity
98%HPLC
CAS RN
1594-57-6
Appearance
White crystalline powder
Purity
≥99%HPLC
CAS RN
172089-14-4
Appearance
Colorless to light yellow or orange oily substance
Purity
≥98% HPLC
Methyl 1-Boc-piperidine-3-carboxylate
CAS RN
148763-41-1
Appearance
Off white to light yellow powder
Purity
98% GC
Methyl 1-Boc-piperidine-4-carboxylate
CAS RN
124443-68-1
Appearance
Light yellow liquid
Purity
98% GC
CAS RN
14273-92-8
Appearance
Colorless Transparent Liquid
Purity
97.4% GC
(4-Fluorobenzyl)triphenylphosphonium chloride
CAS RN
3462-95-1
Appearance
White crystalline powder
Purity
99% HPLC
Ethyl 2-[(diphenylmethylene)amino]-2-ethylbutanoate
CAS RN
189631-94-5
Appearance
Purity
Methyl (triphenylphosphoranylidene)acetate
CAS RN
2605-67-6
Appearance
White powder
Purity
99.2% HPLC
N-Boc-imino-(triphenyl)phosphorane
CAS RN
68014-21-1
Appearance
White crystal
Purity
98% HPLC
CAS RN
2398-81-4
Appearance
White to almost white or light yellow powder
Purity
≥98% HPLC
Tert-Butyl 4-hydroxyphenethylcarbamate
CAS RN
64318-28-1
Appearance
White crystalline powder
Purity
97% GC
2-Ethoxybenzamidine hydrochloride
CAS RN
18637-00-8
Appearance
White to off white powder
Purity
98% HPLC
CAS RN
931-19-1
Appearance
White to brown solid or colorless to brown liquid
Purity
≥97% HPLC
3,8,11-Trioxa-5-azatridecan-13-oic acid
CAS RN
108466-89-3
Appearance
Off white to white solid powder
Purity
98% HPLC
4-cyclohexyl-piperazine-1-carboxylic acid tert-butyl ester
CAS RN
1224935-95-8
Appearance
White powder
Purity
97% HPLC
CAS RN
889676-37-3
Appearance
Off white to white powder
Purity
≥99.0%HPLC
amino-hydroxyimino-acetic acid ethyl ester
CAS RN
1217428-98-2
Appearance
White solid
Purity
>98%
CAS RN
954-81-4
Appearance
White to off white solid
Purity
≥98% GC
CAS RN
85908-96-9
Appearance
Colorless to yellowish liquid or white crystal
Purity
>98% HPLC
[2-(4-maleimidophenyl)]acetic acid
CAS RN
91574-45-7
Appearance
Yellow solid
Purity
98% HPLC
1-cyclopentylhydrazine dihydrochloride
CAS RN
645372-27-6
Appearance
White solid
Purity
>98%
CAS RN
54247-27-7
Appearance
Colorless to light yellow transparent liquid
Purity
≥98% GC
CHLOROGLYOXYLIC ACID METHYL ESTER
CAS RN
5781-53-3
Appearance
Pale yellow transparent liquid
Purity
>97% T
CAS RN
170384-29-9
Appearance
Off-white to white crystalline powder
Purity
≥98.0% GC
CAS RN
112257-19-9
Appearance
Pale yellow to colorless liquid
Purity
>98% GC, HNMR
CAS RN
5329-33-9
Appearance
Off-white to white powder
Purity
≥98.0%
CAS RN
6627-89-0
Appearance
Colorless transparent liquid; 1.05 g/mL at 20 °C(lit.)
Purity
95%HPLC
CAS RN
228244-04-0
Appearance
White to off white solid
Purity
98% HPLC
2-amino-N-benzylacetamide hydrochloride
CAS RN
20432-97-7
Appearance
White crystalline powder
Purity
98-103% T
2-Chloroethylamine hydrochloride
CAS RN
870-24-6
Appearance
Off white to white crystals
Purity
98%-101%
2-[2-(2-AZIDOETHOXY)ETHOXY]ETHANOL
CAS RN
86520-52-7
Appearance
Colorless to light yellow transparent liquid
Purity
≥98% GC
3-Fluorobenzamidine hydrochloride
CAS RN
75207-72-6
Appearance
White powder
Purity
98% HPLC
Biotinamidohexanoyl-6-aminohexanoic acid...
CAS RN
89889-52-1
Appearance
White solid
Purity
>95%
Nalpha-Fmoc-L-lysine hydrochloride
CAS RN
139262-23-0
Appearance
Off white to white solid
Purity
98% HPLC
CAS RN
16066-84-5
Appearance
Transparent liquid or white crystal
Purity
>98.0%(GC)
Isopropylhydrazine hydrochloride
CAS RN
16726-41-3
Appearance
White powder
Purity
99%AT
N-Cbz-piperidine-2-carboxylic acid
CAS RN
71170-88-2
Appearance
White to almost white crystalline powder
Purity
98% HPLC
CAS RN
26351-19-9
Appearance
Off white to white powder
Purity
≥98%HPLC
2-(1,3-dioxo-1,3-dihydro-isoindol-2-yl)ethanesulfonic acid...
CAS RN
81428-07-1
Appearance
White solid powder
Purity
>98% HPLC
D-2-amino-3-(pyridin-3-yl)propanoic acid dihydrochloride
CAS RN
93960-21-5
Appearance
Colorless to yellowish powder
Purity
>99.0% HPLC
Pyrazine-2-carboximidamidehydrochloride
CAS RN
138588-41-7
Appearance
Off white to white solid powder
Purity
>98% HPLC
(S)-2-(tert-butoxycarbonyl)pent-4-enoic acid...
CAS RN
170899-08-8
Appearance
White to off white solid
Purity
>97%
4-Acetamidobenzenesulfonyl azide
CAS RN
2158-14-7
Appearance
White or off white crystal
Purity
≥98%
6,7-Bis-(2-methoxyethoxy)-4(3H)-quinazolinone
CAS RN
179688-29-0
Appearance
Off white to white solid powder
Purity
>99% HPLC
CAS RN
7597-56-0
Appearance
White solid
Purity
HNMR qualified
CAS RN
2615-15-8
Appearance
Pale yellow to colorless transparent liquid
Purity
≥99%
N-Benzylhydroxylamine hydrochloride
CAS RN
29601-98-7
Appearance
White crystalline powder
Purity
98%HPLC
CAS RN
68076-36-8
Appearance
Colorless to yellowish liquid
Purity
97% GC
CAS RN
121492-06-6
Appearance
colorless liquid
Purity
>98% GC, HNMR
CAS RN
5806-90-6
Appearance
Pale yellow to colorless liquid
Purity
>95%(GC, HNMR)
CAS RN
7450-69-3
Appearance
Off white to white powder
Purity
≥98.0%
Tert-butyl N-(2-acetamidoethyl)carbamate
CAS RN
207129-09-7
Appearance
Off white to white solid
Purity
99% GC
2,2-DIETHOXYETHYLPHOSPHONIC ACID DIETHYL ESTER
CAS RN
7598-61-0
Appearance
Pale yellow to colorless transparent liquid
Purity
98.0%(GC)
2,2-dimethyl-N-(4-oxo-1,7-dihydropyrrolo[2,3-d]pyrimidin-2-y...
CAS RN
137281-08-4
Appearance
Yellowish brown solid powder
Purity
>95.0%(HPLC)
2,4,6-trimethylbenzenesulfonyl hydrazide
CAS RN
16182-15-3
Appearance
White off white crystalline powder
Purity
97%AT
2,6-Dichloro-4-(trifluoromethyl)aniline
CAS RN
24279-39-8
Appearance
Off white solid to yellowish liquid
Purity
99%HPLC
3-(TRIFLUOROMETHYL)PYRAZOLE-4-CARBOXYLIC ACID ETHYL ESTER
CAS RN
155377-19-8
Appearance
Pale yellow to yellow solid
Purity
98.0%(HPLC)
diethyl 2-(ethoxymethylene)malonate
CAS RN
87-13-8
Appearance
Pale yellow liquid
Purity
>98%
N-(Diphenylmethylene)glycerine tert-butyl ester
CAS RN
81477-94-3
Appearance
White to almost white crystalline powder
Purity
98% HPLC
CAS RN
3612-20-2
Appearance
Transparent to yellow liquid
Purity
98% GC
CAS RN
29897-82-3
Appearance
Colorless to yellowish liquid
Purity
>98%
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