(1,1'-Biphenyl)-4-carboxylic acid, 2',3',4'-trimethoxy-, methyl ester 120666-35-5 2,3,4-Tcb 2,3,4-Trimethoxy-4'-carbomethoxy-1,1'-biphenyl Methyl 2',3',4'-trimethoxy-(1,1'-biphenyl)-4-carboxylate