1-Piperazinecarboxylic acid, 4-(2-ethyl-10H-thieno(2,3-b)(1,5)benzodiazepin-4-yl)-, ethyl ester 4-(2-Ethyl-10H-thieno(2,3-b)(1,5)benzodiazepin-4-yl)-1-piperazinecarboxylic acid ethyl ester 61325-90-4 BRN 1047218