Photoresist Chemicals Carbonic acid, (5R,7R)-3-(2-bromo-4-chloro-6-ethylphenyl)-7-butoxy-2-oxo-1-azaspiro[ 4.5]dec-3-en-4-yl 2-propenyl ester, rel- Cas：872845-82-4 Molecular Formula：C25H31BrClNO5