A novel positive‐type polyimide precursor (BPDA/DDE) has been developed and examined. It is synthesized by the polycondensation of biphenyltetracarboxylic acid dianhydride and 4,4′‐diamino‐diphenyl ether, based on systems composed of dimethyl 1,4‐dihydro‐2,6‐dimethyl‐4‐(2‐nitrophenyl)‐3,5‐pyridinecarboxylate (nifedipine). Nifedipine photoconverted quantitatively to 4‐(2′‐nitrosophenyl)‐2,3‐dicarboxymethyl‐3,5‐dimethylpyridine (NDMPy) in a polyimide precursor film. It has been confirmed that nifedipin…
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