(1′R,2R,4′S,5S,6R,8′R,10′Z,13′R,14′Z,16′Z,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~]pentacos a[10,14,16,22]tetraen]-2′-one

(1′R,2R,4′S,5S,6R,8′R,10′Z,13′R,14′Z,16′Z,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~]pentacos a[10,14,16,22]tetraen]-2′-one

(1R,4S,5′S,6R,6′R,8R,10Z,13R,14Z,20R,21R,24S)-21,24-dihydroxy-5′,6′,11,13,22-pentamethylspiro[3,7,19-trioxatetracyclo[15.6.1.14,8.020,24]pentacosa-10,14,16,22-tetraene-6,2′-oxane]-2-one

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

Milbemectin A3

Milbemycin A3