IUPAC name or sequence: (1R,4S,5’S,6R,6’R,8R,10E,12S,13S,14E,16E,20R,21R,24S)-6′-[(2S)-butan-2-yl]-21,24-dihydroxy-12-[(2R,4S,5S,6S)-5-[(2S,4S,5S,6S)-5-hydroxy-4-methoxy-6-methyloxan-2-yl]oxy-4-methoxy-6-methyloxan-2-yl]oxy-5′,11,13,22-tetramethylspiro[3,7,19-trioxatetracyclo[15.6.1.14,8.020,24]pentacosa-10,14,16,22-tetraene-6,2′-oxane]-2-one
Other names: Ivermectin B1a (main component)
Ivermectin is a mixture of avermectin B1a (at least 80 percent) and B1b. The data shown are for the main component, B1a.