(E)-4-methoxy-6-(4-methoxystyryl)-5,6-dihydro-2H-pyran-2-one

5,6-dihydro-6-ethenyl-4-hydroxy-2H-pyran-2-one

6-(4-methoxy-trans-styryl)-pyran-2,4-dione

重氮甲烷

6-(4-methoxy-phenethyl)-pyran-2,4-dione