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12-HYDROXYSTEARIC ACID 4-Hydroxycinnamic acid Diethyl acetylenedicarboxylate Acetylenedicarboxylic acid 4-HYDROXY-4-METHYL-PENT-2-YNOIC ACID 3-(1-HYDROXYCYCLOHEXYL)-2-PROPYNOIC ACID BIS(TRIMETHYLSILYL)ACETYLENEDICARBOXYLATE DI-TERT-BUTYL ACETYLENEDICARBOXYLATE BIS(TRI-N-BUTYLTIN)ACETYLENEDICARBOXYLATE