Photoresist Chemicals Piperidinium,1,1′-[(2,4-diphenyl-1,3-cyclobutanediyl)bis(carbonyloxy-4,1-butanediyl)]bis[1-methyl-,diiodide, (1a,2a,3a,4b)- (9CI) Cas：7387-90-8 Molecular Formula：C38H56 N2 O4 . 2 I