D-哌啶-2-甲酸

(S,E)-7-(5-methyl-2-oxo-2,5-dihydrofuran-3-yl)hept-6-enal

哌可啉

2(5H)-Furanone, 5-methyl-, (5S)-

4,5,6,7-tetrahydro-2-benzofuran