The compounds of formulas (I), (II), (III) and (IV), where the symbols are as defined in the specification are prodrugs of proton pump inhibitors. The R
4
group includes at least one acidic group or its pharmaceutically acceptable salt, and the compound having the R
4
group have improved aqueous solubility, stability in plasma and improved bioavailability.
式(I)、(II)、(III)和(IV)的化合物,其中符号如规范中所定义,是质子泵
抑制剂的前药。R4基团包括至少一个酸性基团或其药学上可接受的盐,并且具有R4基团的化合物具有改善的
水溶性、血浆稳定性和改善的
生物利用度。