Photoresist Chemicals Pregna-1,4-diene-7,21-dicarboxylic acid,17-hydroxy-3-oxo-,7-methyl ester,monopotassium salt,(7R,17R)- Cas：56675-26-4 Molecular Formula：Pregna-1,4-diene-7,21-dicarboxylic acid,17-hydroxy-3-oxo-,7-methyl ester,monopotassium salt,(7R,17R)-