28330-19-0 3-Furoic acid, tetrahydro-2-oxo-5-(2-propynyloxymethyl)-, ethyl ester BRN 1376913 Propargyloxymethyl-4 carbethoxy-2 gamma-butyrolactone gamma-Butyrolactone, 2-ethoxycarbonyl-4-(2-propynyloxymethyl)-