Putrescine (sometimes spelled putrescin or putrescene) is an organic chemical compound NH2(CH2)4NH2 (1,4-diaminobutane or butanediamine) formed by and having the smell of rotting flesh.

formed by the action of ornithine decarboxylase on ornithine.

a colorless crystalline ptomaine with a foul odor that is produced in decaying animal matter