(1′R,2S,4′S,5S,6R,8′R,12′S,13′S,20′R,21′R,24′S)-6-[(2S)-2-Butanyl]-21′,24′-dihydroxy-5,11′,13′,22′-tetramethyl-2′-oxo-5,6-dihydrospiro[pyran-2,6′-[3,7,19]trioxatetracyclo[15.6.1.1~4,8~.0~20,24~]pentac osa[10,14,16,22]tetraen]-12′-yl (4ξ)-2,6-dideoxy-4-O-(2,6-dideoxy-3-O-methyl-α-L-arabino-hexopyranosyl)-3-O-methyl-L-threo-hexopyranoside