(1′R,2R,4′S,8′R,20′R,21′R,24′S)-6-Ethyl-21′,24′-dihydroxy-5,11′,13′,22′-tetramethyl-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]tetrae n]-2′-one

(1′R,2R,4′S,8′R,20′R,21′R,24′S)-6-Ethyl-21′,24′-dihydroxy-5,11′,13′,22′-tetramethyl-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]tetrae n]-2′-one

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

51596-11-3

Milbemycin A4

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