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          1. Alphanumeric screening:
            Chemical products
            4'-chloro-2'-nitroacetanilide 4-Chlor-2-nitro-acetanilid
            4-methoxypyridin-2-amine 4-imidazolylphenylamine
            4‘-Chloroacetanilide 4-Chloroacetanilide
            4'-Chloroacetanilide 4-benzoylamino-aniline
            4′-Aminobenzanilide 4,6-dimethylpyridin-2-amine
            4-(4-methoxyphenyl)-1-butanol 4-Acetamido-N-(2-aminophenyl)benzamide
            4-Bromopuinoline 4-Bromchinolin
            4-bromo-quinoline 4-Acetamidoaniline
            4‘-Aminoacetanilide 4-sulfamoylbenzoic acid
            4-Sulfamylbenzoic acid 4-Carboxybenzenesulfonamide
            4-tert-Butylbenzoic hydrazide 4-tert-Butylbenzohydrazide
            4-Tert-Butylbenzhydrazide 4-tert-Butylbenzoylhydrazine
            4-(tert-Butyl)benzohydrazide 4-METHOXY-4-PYRIDINECARBOXYLIC ACID
            4-Cyano-2-fluorobenzaldehyde 4-chlorophenylhydrazine monohydrochloride
            4-CHLOROPHENYLHYDRAZINE HCL 4-CHLORO PHENYL HYDRAZXINE HYDROCHLORIDE
            4-Cl-phenylhydrazine hydrochloride 4-Pentenyl Bromide
            4-bromo pyridine 4-Bromopyridinehydrochloride
            4-Br-pyridine 4-pyridyl-Br
            4-brompyridine 4-pyridyl bromide
            4-bromomethyl-2'-tert-butoxycarbonylbiphenyl 4-Fmoc-aminobutyric acid
            4-Fmoc-aminobutanoic acid 4-Chlorophthalic anhydride
            4-Nitropyridine-2-carboxylic Acid 4-NITROPICOLINIC ACID
            4-(tert-Butoxycarbonylaminomethyl)piperidine 4-(Boc-Aminomethyl)Piperidine
            4-bromo-3-fluoro-1-iodobenzene 4-bromo-3-fluoro-iodobenzene
            4-methoxy-3-methylaniline 4-Fluoro-m-tolylboronic Acid
            4-Fluoro-3-methylphenylboronic Acid 4-Fluoro-3-methylbenzeneboronic Acid
            4-Carboxybenzeneboronic Acid 4-Boronobenzoic acid
            4-Carboxyphenylboronic Acid 4-Amino-2-Chloropyridine
            4-METHOXY TRITYL CLHORIDE 4-Methoxytrityl chloride 4
            4-Methoxytriphenylmethyl chloride 4-Methoxytriphenylmethylchloride
            4-Methoxytrityl Chloride [Hydroxyl Protecting Agent] 4-METHOXTRITYL CHLORIDE
            4-METHOXYTRITYL CHLORIDE 4-Monomethoxytrityl chloride
            4-Bromo-3-methyl-benzoic acid methyl ester 4-Bromo-3-methylbenzoic Acid Methyl Ester
            4-Bromo-m-toluic Acid Methyl Ester 4-IODOBENZALDEHYDE
            4-Bromo-2-chlorobenzaldehyde 4-Bromoethylbenzene
            4-nitrophenylpropionic acid 4-nitrohydrocinnamic acid
            4-nitrobenzenepropanoic acid 4-bromo-2-hydroxybenzoic acid
            4-Bromosalicylic acid 4-Pyridylboronic Acid
            4-Pyridinylboronic acid 4-Pyridineboronic acid
            4,6-Dichloro-2-methyl-pyrimidine 4,6-Dimethoxy-2-methylmercapyrimidine
            4,6-dichlor-2-methylpyrimidin 4-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)benzoic Acid
            4-carboxyphenylboronic acid pinacolate 4-Carboxyphenylboronicacidpinacolester
            4-carboxyphenylboronic acid,pinacol cyclic ester 4-Carboxyphenylboronic Acid Pinacol Ester
            4-Carboxybenzeneboronic acid pinacol ester 4-Carboxylphenylboronic acid pinacol ester
            4-carboxybenzeneboronic acid pinacolcyclicester 4-methoxycarbonyl-2-methylaniline
            4-amino-3-methyl-benzoate methyl ester 4-amino-m-toluic acid methyl ester
            4-amino-3-methylbenzoic acid methyl ester 4-Tolylboronic acid
            4,6-Dihydroxy-2-methylmercaptopyrimidine 4,6-Dihydroxy-2-(methylmercapto)pyrimidine
            4,6-Dihydroxy-2-(methylthio)pyrimidine 4,6-Dihydroxy-2-methylthiopyrimidine
            4-Amino-3-picoline 4-Amino-3-Methylpyrimidine
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