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An Introduction to Medicinal Chemistry

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Development of metiamide 297<br />

the same pK a as for imidazole itself, which shows that the electronic effects of the<br />

methyl group and the side-chain are cancelling each other out as far as pK a is<br />

concerned.) A pK a of 6.80 means that 20 per cent of metiamide is ionized in the<br />

imidazole ring. However, this is still significantly lower than the corresponding 40 per<br />

cent

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