1. A liquid composition which is an aqueous solution of a compound of formula (I) wherein R is selected from H, —CH — OR, —CH — S — R and —CH — NRR； R is selected from —CH-OR, —CH-S-R and —CH — NRR； R and R are the same or different independently selected from H； substituted or unsubstituted, unbranched or branched, saturated or unsaturated C3-C12 cycloalkyl or C1-C10 alkyl； substituted or unsubstituted benzyl； substituted or unsubstituted mono- or bicyclic aryl； substituted or unsubstituted mono-, bi- or tricyclic C2-C10 heteroaryl or non-aromatic C2-C10 heterocyclyl containing one or more heteroatoms independently selected from N, O and S； or R and Rb —CH — NRR are linked together and form, with the nitrogen atom to which they are attached, a substituted or unsubstituted non-aromatic C2-C10 mono- or bicyclic heterocyclyl, optionally containing one or more additional heteroatoms independently selected from N, O and S and optionally containing one or more cyclic keto groups； wherein the substituents of the substituted groups are independently selected from straight or branched, saturated or unsaturated C3-C12 cycloalkyl or C1-C10 alkyl； halogen； halogen-substituted C1-C10 alkyl, mono- or bicyclic aryl； mono-, bi- or tricyclic C2-C10 heteroaryl or non-aromatic C2-C10 heterocyclyl containing one or more heteroatoms independently selected from N, O and S； C1-C10 alkoxy groups； an amino group and a C1-C10 alkylamino group； and its pharmaceutically acceptable salts, a pH adjusting agent； wherein the aqueous solution has a pH value of from 3.0 to 5.0.2. The liquid composition according to claim 1, where R select1. Жидкая композиция, которая представляет собой водный раствор соединения формулы (I)в которой Rвыбирают из Н, -CH-O-R, -CH-S-Rи -CH-NRR；Rвыбирают из -CH-O-R, -CH-S-Rи -CH-NRR；Rи Rявляются одинаковыми или разными, независимо выбранными из Н； замещенного или незамещенного, неразветвленного или разветвленного, насыщенного или ненасыщенного С3-С12 циклоалкила или С1-
