Ranitidine sulfur-containing side chain has substituted guanidine with pka of 2.7 for the secondary amine. Thus, this side chain is thus at physiological pH? N-CH₂ H₂C Rantine Ch NO₂ Currently Selected: B A lonized, protonated B Unionized, Deprotonated Clonized, deprotonated D Unionized, profonated and

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