3-Butynal, 2-methylene-

CAS:89026-72-2

Formula:C5H4O

2-Penten-4-ynal

CAS:65388-78-5

Formula:C5H4O

Ethenone, 2-cyclopropen-1-yl-

CAS:94923-07-6

Formula:C5H4O

2-Penten-4-ynal, (E)-

CAS:34501-85-4

Formula:C5H4O

2H-Pyran, 2,3-didehydro-

CAS:397330-05-1

Formula:C5H4O

2,4-Pentadiyn-1-ol

CAS:41345-53-3

Formula:C5H4O

4-methylidenecyclobut-2-en-1-one

CAS:42827-31-6

Formula:C5H4O

cyclopenta-2,4-dien-1-one

CAS:13177-38-3

Formula:C5H4O

1,3-Butadiyne, 1-methoxy-

CAS:139565-86-9

Formula:C5H4O

1-Penten-4-yn-3-one

CAS:15885-84-4

Formula:C5H4O