preferred_name: spiro[[7-methoxy-5-methyl-1,2-dihydronaphthalene]-3,1'-[5-hydroxy-9-[2-methylamino-2,6-dideoxygalactopyranosyloxy]-5-(2-oxo-1,3-dioxolan-4-yl)-3a,5,9,9a-tetrahydro-3H-1-oxacyclopenta[a]-s-indacen-2-one]]