1,2-Cyclobutanedicarboxylic acid, mono(1-((4-methyl-1-piperazinyl)methyl)-2-(2-(2-phenylethyl)phenoxy)ethyl) ester 2-((3-(4-Methyl-1-piperazinyl)-2-(2-carboxycyclobutylcarbonyloxy))propoxy)bibenzyl GU1757500