(3R,6S)-6-isopropyl-3-(2-propenyl)morpholine-2,5-dione

(2R,4'R,5'S)-2-amino-1-(3',4'-dimethyl-2'-oxo-5'-phenyl-1'-imidazolydinyl)-4-penten-1-one

(1S,2R,8R)-8,11,11-trimethyl-3-oxa-6-azatricyclo[6.2.1.02,7]-undec-6-en-4-one

(3R,6S)-3-allyl-6-tert-butyl-5-methoxy-6-methyl-3,6-dihydro-2H-1,4-oxazin-2-one

(3S,6R,7aR,1'R,4'S)-1-oxo-6-[(trimethylsilyl)methyl]-1,6,7,7a-tetrahydroisoxazolo[2,3-c]oxazole-3-spiro-3'-menthane