napyradiomycin C2

3,4a,13-Trichloro-2,3,4,4a,11,12,13,14,15,18-decahydro-9,20-dihydroxy-2,2,16-trimethyl-12-methylene-7,18a-methano-6,10-metheno-5H-cyclohexadeca[b]pyran-5,19-dione