ethyl 3-morpholin-4-ylbut-2-enoate

(E)-4-morpholinopent-3-en-2-one

Propanedioic acid, [1-(4-morpholinyl)ethylidene]-, diethyl ester

4-(3-phenyl-1,2-oxazol-5-yl)morpholine

2-吗啉基-5-硝基吡啶