(1′R,2R,4′S,5S,13′R,20′R,21′R,24′S)-21′,24′-Dihydroxy-5,6,11′,13′,22′-pentamethyl-3,4,5,6-tetrahydro-2′H-spiro[pyran-2,6′-[3,7,19]trioxatetracyclo[15.6.1.1~4,8~.0~20,24~]pentacosa[10,14,16,22]tetraen] -2′-one

(1′R,2R,4′S,5S,13′R,20′R,21′R,24′S)-21′,24′-Dihydroxy-5,6,11′,13′,22′-pentamethyl-3,4,5,6-tetrahydro-2′H-spiro[pyran-2,6′-[3,7,19]trioxatetracyclo[15.6.1.1~4,8~.0~20,24~]pentacosa[10,14,16,22]tetraen] -2′-one

(6R,25R)-5-O-Demethyl-28-deoxy-6,28-epoxy-25-methylmilbemycin B

Milbemycin B, 5-O-demethyl-28-deoxy-6,28-epoxy-25-methyl-, (6R,25R)-