(1R,2R,2'R,5R,5'S,6'R,8S,12R,14E,16S,17S,18E,20E,24S)-16-{[(2R,4S,5S,6R)-5-{[(2S,4S,5S,6S)-5-hydroxy-4-methoxy-6-methyl-3,4,5,6-tetrahydro-2H-pyran-2-yl]oxy}-4-methoxy-6-methyl-3,4,5,6-tetrahydro-2H-pyran-2-yl]oxy}-2,24-dihydroxy-3,5',15,17-tetramethyl-6'-(prop-2-yl)-3',4',5',6'-tetrahydrospiro[7,11,23-trioxatetracyclo[19.2.1.18,12.05,24]pentacosa-3,14,18,20-tetraene-10,2'-pyran]-6-one