| Number | Date | Country | Kind |
|---|---|---|---|
| 43 31 178.4 | Sep 1993 | DEX |
| Number | Date | Country |
|---|---|---|
| 0326328 | Aug 1989 | EPX |
| 0414368 | Feb 1991 | EPX |
| 0424125 | Apr 1991 | EPX |
| 0453137 | Oct 1991 | EPX |
| 0452002 | Oct 1991 | EPX |
| 0467760 | Jan 1992 | EPX |
| WO9319050 | Sep 1993 | WOX |
| Entry |
|---|
| Bergmann et al, Chemical Abstracts, vol. 79, entry 77808 (1973). |