Eribulin Impurity 3

Chemical Name: 7,11:10,14:13,16:21,24:27,31-Pentoepoxy-2H-cyclohentriaconta[b]furan-5,18(3H,4H)-dione,2-[(2S)-3-amino-2-hydroxypropyl]octacosahydro-12,15-dihydroxy-3-methoxy-29-methyl-23,30-bis(methylene)-,(2R,3R,3aS,7R,10S,11R,12S,13S,14S,15S,16R,21S,24S,27S,29R,31R,32aS)-