呋芬雷司

calcium (1R,2S,3R,4S)-7-oxabicyclo[2.2.1]hept-5-ene-2,3-dicarboxylate

Thiophene(SIV)

甲基(1S,2S,4S)-7-氧杂双环[2.2.1]庚-5-烯-2-羧酸酯

2,5,8-trioxabicyclo[7.1.0]deca-3,6-diene