benzyl 4-oxospiro[chromane-2,4'-piperidine]-1'-carboxylate

4-氧代-2-螺(N-叔丁基哌啶-4-基)-吡喃

2'-羟基苯乙酮

1-Cbz-4-哌啶酮

1'-acetylspiro[chromene-2,4'-piperidin]-4(3H)-one