ethyl (2E,4R,5R)-4,5-dihydroxy-4-methylhex-2-enoate

(4S,5S,6S)-3,4,5,6-tetrahydro-4-hydroxy-5,6-dimethyl-2H-pyran-2-one

(3R,4R,5S,6S)-3,4,5,6-tetrahydro-4-hydroxy-3,5,6-trimethyl-2H-pyran-2-one

(3R,4R,5S,6S)-3,4,5,6-tetrahydro-3,5,6-trimethyl-4-(triethylsilyloxy)-2H-pyran-2-one