Number | Date | Country | Kind |
---|---|---|---|
1-223215 | Aug 1989 | JPX | |
2-59935 | Mar 1990 | JPX |
This is a divisional of copending application Ser. No. 07/689,052 filed on Apr. 29, 1991 now abandoned.
Number | Name | Date | Kind |
---|---|---|---|
3674749 | Craven | Jul 1972 | |
3763161 | Hartter | Oct 1973 | |
3928351 | Donald | Dec 1975 |
Number | Date | Country |
---|---|---|
8801264 | Feb 1988 | WOX |
Entry |
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Begland et al, J. Org. Chem. 39, p. 1235 (1974). |
The Pyrazines by G. B. Barlin, vol. 41, of The Chemistry of Heterocyclic Compounds, pp. 35-36, 98, 126, 128, 129, 280 (1982). |
Number | Date | Country | |
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Parent | 689052 | Apr 1991 |