cyclopropyl ketoacid

2-糠酸乙酯

(3R,5S,8R,9S,10S,13S,14S,17S)-10,13-dimethylspiro[1,2,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydrocyclopenta[a]phenanthrene-3,2'-oxirane]-17-ol

4,4,7-trimethylbicyclo[5.1.0]oct-2-en-6-one

1-氧杂-5-氮杂螺[2.4]庚烷-5-甲酸叔丁酯