(4-Oxo-4H-1-benzopyran-3-yl)aminooxoacetic acids and their derivatives
US4076729A · kind A · utility
2Cited by
2References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 2, 1976 |
| Grant date | Feb 28, 1978 |
| Priority date | — |
| Expiry date | Aug 2, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C205/45
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to compounds of the formula: ##STR1## wherein R.sub.1 is hydrogen, halogen, hydroxy, lower alkoxy or lower alkyl, R.sub.2 is hydrogen or lower alkyl; R.sub.3 is hydrogen or lower alkyl. These compounds, including their corresponding pharmaceutically acceptable salts, are useful in the management of allergic conditions such as hay fever and as a prophylactic in the treatment of bronchial asthma.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.