Number | Date | Country | Kind |
---|---|---|---|
4418/87 | Nov 1987 | CHX |
Number | Name | Date | Kind |
---|---|---|---|
4070508 | Ishige et al. | Jan 1978 | |
4831141 | Berneth et al. | May 1989 | |
4835270 | Berneth | May 1989 |
Number | Date | Country |
---|---|---|
0187329 | Jul 1986 | EPX |
Entry |
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R. M. Acheson, An Introduction to the Chemistry of Heterocyclic Compounds, Interscience Publishers, New York (1960) pp. 127-132, 150-152 and 154-157. |