136471-32-4 Encyclan Furo[2,3-b]quinoxaline-3-carboxylic acid, 3a,4,9,9a-tetrahydro-2,9-dimethyl-, isobornyl ester,(R-exo) Furo[2,3-b]quinoxaline-3-carboxylic acid, 3a,4,9,9a-tetrahydro-2,9-dimethyl-,1,7,7-trimethylbicyclo[2.2.1]hept-2-yl ester NSC695643