(11R,20R)-23,26-dichloro-14-[[2-[4-[[(2S)-1,4-dioxan-2-yl]methoxy]phenyl]pyrimidin-4-yl]methoxy]-3-(4-fluorophenyl)-24,25-dimethyl-20-[(4-methylpiperazin-1-yl)methyl]-10,18,21-trioxa-4-thia-6,8-diazapentacyclo[20.2.2.12,5.113,17.09,28]octacosa-1(25),2,5,7,9(28),13,15,17(27),22(26),23-decaene-11-carboxylic acid