2-oxabicyclo[2.2.1]heptane-1-carboxylic acid, 4,7,7-trimethyl-3-oxo-, 2-[(7-ethoxy-2-oxo-2H-1-benzopyran-3-yl)carbonyl]hydrazide;7-Ethoxy-2-oxo-N'-[(4,7,7-trimethyl-3-oxo-2-oxabicyclo[2.2.1]hept-1-yl)carbonyl]-2H-chromene-3-carbohydrazide
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