1-(2-Cyanoethyl)-4-(2-naphthyl)piperazine maleate 1-Piperazinepropanenitrile, 4-(2-naphthalenyl)-, (Z)-2-butenedioate (1:1) 4-(2-Naphthalenyl)-1-piperazinepropanenitrile maleate 57537-04-9