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It is reported that site-specific photon stimulated ion desorption (PSID) occurs in thin film of poly-methylmethacrylate (PMMA) by monochromatic soft X-ray. In this study, we take notice of an importance of the functional group (ester group) in the side chain of PMMA and have studied PSIDs of condensed methylisobutylate and dimethylcarbonate molecules, which have same ester groups as PMMA.