62052-60-2 Butanedioic acid, mono(2-(2-(1-methylethoxy)-1-((1-methylethoxy)carbonyl)-2-oxoethylidene)-1,3-dithiolan-4-yl) ester Diisopropyl 4-hydroxy-1,3-dithiolan-2-ylidene malonate succinic acid semi-ester