RORIDIN A

(1′R,2R,3′R,8′R,12′S,13′R,17′R,18′E,20′Z,24′R,25′S)-12′-Hydroxy-17′-[(1R)-1-hydroxyethyl]-5′,13′,25′-trimethyl-11′H,22′H-spiro[oxirane-2,26′-[2,10,16,23]tetraoxatetracyclo[22.2.1.0~3,8~.0~8,25~]heptac osa[4,18,20]triene]-11′,22′-dione

RORIDIN A