Number | Date | Country | Kind |
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1-312885 | Dec 1989 | JPX |
Entry |
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Greene, Protective Groups in Organic Synthesis, pp. 29, 30, 32-36, 47, 79, 80, 168, 239, 265-266, Wiley-Interscience Pub. (1981). |
Klingsberg, Pyridine and Its Derivatives, Part Two, pp. 134-135, (1961). |