Photoresist Chemicals Piperidine,4-(9,10-dihydro-10-methyl-4Hbenzo[ 4,5]cyclohepta[1,2-b]thien-4-ylidene)-1- methyl-,(2Z)-2-butenedioate (1:1) Cas：59275-17-1 Molecular Formula：C24H27NO4S