Number | Date | Country | Kind |
---|---|---|---|
2537353 | Aug 1975 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
3950334 | Riebel | Apr 1976 |
Number | Date | Country |
---|---|---|
2049813 | Apr 1972 | DEX |
3826389 | Dec 1973 | JPX |
Entry |
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FBA, Chem. Abs., 73, 14998(a), 1970. |
Taketa I, Chem. Abs. 60, 6869f (1963). |