16150-45-1 4H-1-Benzopyran-2-carboxylic acid, 5,5'-((2-hydroxy-1,3-propanediyl)bis(oxy))bis(4-oxo-, diethyl ester 4H-1-Benzopyran-2-carboxylic, 5,5'-((2-hydroxytrimethylene)dioxy)bis(4-oxo-, diethyl ester BRN 1337752 Cromoglycic acid diethyl ester Cromophene Diethyl cromoglycate