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1. A compound having the structure of Chemical Formula 1 or a pharmaceutically acceptable salt thereof: wherein R1 is hydrogen or a methyl group, R2 is hydrogen, a naphthyl group, a straight- or branched-chain alkyl group having 1 to 5 carbon atoms, —COC6H5, or a substituted or unsubstituted phenyl group or benzyl group, in which one or more hydrogen atoms of the substituted phenyl group or benzyl group are each independently substituted with one selected from the group consisting of halogen, a straight- or branched-chain alkyl group having 1 to 3 carbon atoms, and trifluoromethoxy, R3 is a straight- or branched-chain alkyl group having 1 to 5 carbon atoms, a tetrazole group, a cyclic alkyl group having 3 to 10 carbon atoms, or a substituted or unsubstituted aromatic compound having 6 to 12 carbon atoms, in which one or more hydrogen atoms of the substituted aromatic compound are each independently substituted with one selected from the group consisting of halogen and a straight- or branched-chain alkyl group having 1 to 3 carbon atoms, and X is hydrogen halide or does not exist.
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