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. 2008 Oct 16;13(10):2557–2569. doi: 10.3390/molecules13102557

Scheme 1.

Synthetic Pathway for Compounds 3-5.

Scheme 1

Reaction conditions: i) dry ether, ii) NH2C(NH)NH2·HCl, n-butanol, TEA, iii) NH2NH2·H2O, n-butanol