4S,5S-5-Mesyloxymethyl-4-methyl-4,5-dihydro-2(3H)-furanon

(S)-3-Methyl-pent-4-enoic acid (1R,2S,3R,4S)-3-[benzenesulfonyl-(3,5-dimethyl-phenyl)-amino]-1,7,7-trimethyl-bicyclo[2.2.1]hept-2-yl ester

methyl (R)-3-methyl-5-o-nitrophenylselenopentanoate

1-methyl hydrogen (R)-3-methylhexanedioate