131774-53-3 KS 505a KS-505a beta-D-Glucopyranosiduronic acid, 1-carboxy-2,3,4,4a,4b,5,6,6a,6b,7,8,8a,8b,9,10,10a,14,16,17,17a,17b,18,19,19a,19b,20,21,21a,21b,22,23,23a-dotriacontahydro-14-hydroxy-8a,10a-bis(hydroxymethyl)-14-(3-methoxy-3-oxopropyl)-1,4,4a,6,6a,17b,19b,21b-octameth beta-D-Glucopyranosiduronic acid, 1-carboxy-2,3,4,4a,4b,5,6,6a,6b,7,8,8a,8b,9,10,10a,14,16,17,17a,17b,18,19,19a,19b,20,21,21a,21b,22,23,23a-dotriacontahydro-14-hydroxy-8a,10a-bis(hydroxymethyl)-14-(3-methoxy-3-oxopropyl)-1,4,4a,6,6a,17b,19b,21b-octamethyl-16-oxo-1H-benzo(9,10)piceno(3,4-a)furo(3,4-j)xanthen-2-yl 2-O-methyl