Number | Name | Date | Kind |
---|---|---|---|
2224910 | Hanford et al. | Dec 1940 | |
3865850 | Merger | Feb 1975 | |
4615970 | Kojima et al. | Oct 1986 | |
5144088 | Salek et al. | Sep 1992 |
Number | Date | Country |
---|---|---|
0262029 | Nov 1988 | DEX |
1608182 | Nov 1990 | SUX |
Entry |
---|
Tetrahedron Letters, vol. pp. 4517-4520 (1980). |