3,3-dimethyl-2-methylene-2,3-dihydro-furo[3,2-c]chromen-4-one

(1R,2aR,8bR)-8b-hydroxy-1,2,2-trimethyl-1,2,2a,8b-tetrahydro-3H-cyclobuta[c]chromen-3-one

3-氯-3-甲基-1-丁炔

2-甲基-3-丁炔-2-醇

4-(3-methylbut-2-enoxy)chromen-2-one