Chemical Name: (3S,8R,9S,10R,13S,14S)-10,13-dimethyl-1,2,3,4,7,8,9,10,11,12,13,14,15,16-tetradecahydrospiro[cyclopenta[a]phenanthrene-17,2'-[1,3]dioxolan]-3-ol
Synonym: Clozapine impurity D (USP) ; 1,4-bis(8-chloro-5H-dibenzo[b,e][1,4]diazepin-11-yl)piperazine