napyradiomycin C1

3,4a-Dichloro-2,3,4,4a,11,14,15,18-octahydro-9,20-dihydroxy-2,2,12,16-tetramethyl-7,18a-methano-6,10-metheno-5H-cyclohexadeca[b]pyran-5,19-dione