1515-21-5 4,7-Etheno-3H-furo[3,4-c]pyran-1,3,6-trione, 3a,4,7,7a-tetrahydro- 4,7-Etheno-3H-furo[3,4-c]pyran-1,3,6-trione, 3a,4,7,7a-tetrahydro-, (3a.alpha.,4.beta.,7.beta.,7a.alpha.)- NSC316142