| 3-(1-phthalazinyl)-carbazic aci ethyl ester |
| 3-(1-phthalazinyl)carbazic acid ethyl ester |
| bt 621 |
| carboethoxyphthalazinohydrazine |
| ethyl 3-(1-phthalazinyl)carbazate |
| 2-(1-phthalazinyl)-hydrazinecarboxylic aci ethyl ester |
| n-carboethoxy-n'-phthalazino-hydrazine |
| todralacina |
| todralazine |
