3-Oxabicyclo[3.1.0]hexane-2,4-dione3-Oxabicyclo[3.1.0]hexane-2,4-dione3-氧杂二环[3.1.0]己烷-2,4-二酮1,2-Cyclopropanedicarboxylic anhydride1,2-环丙烷二羧酸酸酐3-Oxabicyclo[3.1.0]hexane-2,4-dioneCyclopropane-1,2-dicarboxylic acid anhydride2,4-Dioxo-3-oxabicyclo[3.1.0]hexane