frenolicin B

3,3aα,5,11bα-Tetrahydro-7-hydroxy-5α-propyl-2H-furo[3,2-b]naphtho[2,3-d]pyran-2,6,11-trione

(3aR)-3,3aα,5,11bα-Tetrahydro-7-hydroxy-5α-propyl-2H-furo[3,2-b]naphtho[2,3-d]pyran-2,6,11-trione

(1R)-1β-Propyl-3,4,5,10-tetrahydro-4α,9-dihydroxy-5,10-dioxo-1H-naphtho[2,3-c]pyran-3α-acetic acid 3,4-lactone