1,6,8-trihydroxy-3-methylbenzo[a]anthracene-7,12-dione 1,6,8-trihydroxy-3-methyl-benzo[a]anthracene-7,12-dione 1,6,8-trihydroxy-3-methyl-benzo[a]anthracene-7,12-quinone C12390 Dehydrorabelomycin