1,8-Dideoxy-1,8-diketocoriolin 74399-39-6 Spiro(cyclopenta(4,5)pentaleno(1,6a-b)oxirene-3(3aH),2'-oxirane)-2,4,7(1aH)-trione, tetrahydro-3a,5,5-trimethyl-, (1aS-(1aalpha,3beta,3abeta,3balpha,6aalpha,7aR*))-