| Busulfan | G1LN9045DK | chemical |
| Butaclamol, (+)- | W85H7VQ3L6 | chemical |
| Butamiphos | KHP91X76U4 | chemical |
| Butan-2-yl 4-(4-cyano-2-methoxyphenyl)-2,8-dimethyl-5-oxo-4,6-dihydro-1H-1,6-naphthyridine-3-carboxylate | RVN8HF9PR2 | chemical |
| Butanamide, N-[2-[(2,6-dicyano-4-nitrophenyl)azo]-5-(diethylamino)phenyl]- | T5A2RX3G8P | chemical |
| Butane, 1-[2-(2-chloroethoxy)ethoxy]- | 9Z343YSV36 | chemical |
| Butane-1,4-diyl diacetoacetate | 77V2P4WCQ2 | chemical |
| Butanoic acid, 4-[[4-bromo-2-(1,1-dimethylethyl)phenyl]amino]-4-oxo- | ZV8FYY95TK | chemical |
| Butanone 2,4-dinitrophenylhydrazone | 9DM5QL2GW2 | chemical |
| Butaprost free acid | 398VD5L7D2 | chemical |
| Butaselen | 6X69LFV24J | chemical |
| Buten-2-yl hexanoate | JS5U783RBU | chemical |
| Butenedioyl chloride | V6J5PN9BPA | mixture |
| Butethrin | EG76L4VZF5 | chemical |
| Butorphanol L-tartrate | V547A4DL9W | chemical |
| Butoxyacetic acid | HYU5VV8C8W | chemical |
| Butoxytriethoxytitanium | VRK6Q9SQD6 | chemical |
| Butrol | SMG09YI7I8 | chemical |
| Butropipazone | 47UB2NB3UD | chemical |
| Butroxydim | LN82LZK7KD | chemical |
| Butyl (1S)-2-oxocyclohexanepropionate | U56XYP39UV | chemical |
| Butyl (4-chlorophenoxy)acetate | W4GQ4U7DMA | chemical |
| Butyl (E)-hex-2-enoate | V75B2T89C6 | chemical |
| Butyl (Z)-hex-2-enoate | 8B8UZC9G5Q | chemical |
| Butyl (methylthio)acetate | QN58WY5942 | chemical |
| Butyl 2,3,4,4,4-pentachlorocrotonate | 33PYD9NB2F | chemical |
| Butyl 2,4-dinitrophenyl carbonate | V2N4XVV5ZF | chemical |
| Butyl 2-butoxy-2-hydroxyacetate | V5HXS9G9VZ | chemical |
| Butyl 2-hydroxyethyl fumarate | FXZ6KQQ9D3 | chemical |
| Butyl 2-hydroxyethyl maleate | G5GN2N2QMR | chemical |
| Butyl 2-oxocyclohexanepropionate | 33NG4XFC78 | chemical |
| Butyl 3,3-dimethylbutyrate | 3DMS868ENH | chemical |
| Butyl 3-butoxybenzoate | M4P6695SWT | chemical |
| Butyl 3-chloropropionate | 65Y66QX9XE | chemical |
| Butyl 3-methyl-2-butenoate | WX95P3767J | chemical |
| Butyl 4-(butylamino)benzoate | SX2Y6T2T3M | chemical |
| Butyl 4-butoxybenzeneacetate | B7WEJ4388Y | chemical |
| Butyl 4-methyl-3-[[4-(3-pyridinyl)-2-pyrimidinyl]amino]benzoate | 2GV47ZM35H | chemical |
| Butyl 4-nitrobenzoate | 363M63697T | chemical |
| Butyl 4-phenylbenzenesulfonate | UQF6Y8HSL5 | chemical |
| Butyl 5-butoxy-2-nitrobenzoate | LRD2P2ND5N | chemical |
| Butyl 5-oxohexanoate | YAE66YGF7Y | chemical |
| Butyl 6-chlorohexanoate | 3ER8L2VEQ2 | chemical |
| Butyl 7,7-dimethyl-2-oxobicyclo[2.2.1]heptane-1-methanesulfonate | X7ALG6W4RC | chemical |
| Butyl D-Phenylalaninate hydrochloride | Y88N9AG257 | chemical |
| Butyl D-phenylalaninate | 636J3YQ953 | chemical |
| Butyl Palmitostearate | 49UG5723MQ | mixture |
| Butyl Stearate | 6Y0AI5605C | chemical |
| Butyl acetate | 464P5N1905 | chemical |
| Butyl acrylate/methyl methacrylate/trimethylsiloxymethacrylate copolymer | Y3BP59PMD3 | polymer |