Synonyms: (1R)-3,4,5,10-Tetrahydro-9-hydroxy-1β-methyl-5,10-dioxo-1H-naphtho[2,3-c]pyran-3α-acetic acid;(1R,3S)-3,4,5,10-Tetrahydro-9-hydroxy-1β-methyl-5,10-dioxo-1H-naphtho[2,3-c]pyran-3α-acetic acid;3,4,5,10-Tetrahydro-1β-methyl-9-hydroxy-5,10-dioxo-1H-naphtho[2,3-c]pyran-3α-acetic acid;Antibiotic YS-02931K-β;ent-Nanaomycin A;YS-02931K-β