1-Piperazinecarboxylic acid, 4-(5-oxo-5H-dibenzo(a,d)cyclohepten-10-yl)-, methyl ester 4-(5-Oxo-5H-dibenzo(a,d)cyclohepten-10-yl)-1-piperazinecarboxylic acid methyl ester 56972-89-5 RMI 61218