6-[(4-methylphenyl)carbamoyl]-7-oxabicyclo[2.2.1]hept-2-ene-5-carboxylic acid 6-[[(4-methylphenyl)amino]-oxomethyl]-7-oxabicyclo[2.2.1]hept-2-ene-5-carboxylic acid NSC641388 Oprea1_492555 3-p-Tolylcarbamoyl-7-oxa-bicyclo[2.2.1]hept-5-ene-2-carboxylic acid BAS 03435785 IVK/8093218 NCI60_013961 Oprea1_487679