在三岁以前，胃酸分泌处于低水平，对酸不稳定的药物，例如青霉素的吸收会增强。
Before then, the stomach has low levels of acid, and acid-labile drugs, such as the penicillins, show enhanced absorption.
以青霉素V钾为原料，采用过氧乙酸作催化剂合成青霉素V亚砜酸，收率可达96.1%。
Penicillin V potassium salt is oxidized with Peracetic acid to synthesize Sulfoxide with a yield of 96.1%.
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