1-Piperazineacetic acid, 4-methyl-, (2'-chloro(1,1'-biphenyl)-4-yl)methyl ester, (Z)-2-butenedioate (1:2) 109523-90-2 4-((4-Methyl-1-piperazinyl)acetoxymethyl)-2'-chlorobiphenyl dihydrogen maleate F 2876