| http://www.w3.org/ns/prov#value | - It is preferable in Formula (II) that R1 is a hydrogen atom, a methyl group, an ethyl group or a propyl group; and R2 and R3 independently are a hydrogen atom, a methyl group, an ethyl group, an isopropyl group, a methoxyethoxyethyl group, a methoxymethoxyethyl group, a methoxyethoxypropyl group, a methoxyethyl group, tetrahydrofurfuryl group, an ethoxyethoxyethoxy group or a hydrocabon group havi
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