ethyl (S)-4-((2R,4R)-7-(((tert-butyldiphenylsilyl)oxy)methyl)-4-hydroxy-5-methoxy-2-methylchroman-2-yl)-4-hydroxybutanoate

(S)-5-((2R,4R)-7-(((tert-butyldiphenylsilyl)oxy)methyl)-4-hydroxy-5-methoxy-2-methylchroman-2-yl)dihydrofuran-2(3H)-one

(S)-5-((R)-7-(((tert-butyldiphenylsilyl)oxy)methyl)-5-methoxy-2-methyl-2H-chromen-2-yl)dihydrofuran-2(3H)-one

(S)-5-((R)-7-(((tert-butyldiphenylsilyl)oxy)methyl)-5-methoxy-2-methylchroman-2-yl)dihydrofuran-2(3H)-one