(organic chemistry) Any amino derivative of levulinic acid, but especially 5-aminolevulinic acid which is an intermediate in the biosynthesis of porphyrin

simple past tense and past participle of whore out

butan-1-ol or n-butanol or butyl alcohol - CH₃(CH₂)₃-OH / butan-2-ol or sec-butanol - CH₃CH₂CH(CH₃)-OH / 2-methyl-propan-1-ol or iso-butanol - (CH₃)₂CHCH₂-OH

(Britain, dated) The person who drives the engine of a train.