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發送短信 : Crystal structure of dimethyl (1α,2β,3α,4β,7β,8α,9β,10α) -13-isopropylidene-pentacyclo[8.2.1.14,7.02,9.0 3,8]tetradeca-5,11-diene-2,9-dicarboxylate, C21H 24O4