1-Piperazineethanol, alpha-(2,3-dihydro-1H-inden-5-yl)-4-(phenylmethyl)-, (Z)-2-butenedioate (1:2) 55020-31-0 alpha-(2,3-Dihydro-1H-inden-5-yl)-4-(phenylmethyl)-1-piperazineethanol dimaleate