| 4-oxo-4h-1-benzopyran-2-carboxylic aci 2-(1-piperazinyl)ethyl ester |
| 2-(1-piperazinyl)ethyl 4-oxo-4h-1-benzopyran-2-carboxylate |
| 4-oxo-4h-1-benzopyran-2-carboxylic acid 2-(1-piperazinyl)ethyl ester |
| 4-oxo-4h-1-benzopyran-2-carboxylic aci2-(1-piperazinyl)ethyl ester |
