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US07879996B2 Water soluble compounds 失效
水溶性化合物

Water soluble compounds
Abstract:
Provided is a compound and methods for preparation thereof according to formula (I) where A1, A2, A3, and A4 are each a group containing 1 to 40 carbon atoms and at least one carboxylic group, R, R′ and R″ are each hydrogen or a group containing 1 to 80 carbon atoms, M is bivalent or an element capable of complexing with a pyrrole nitrogen atom, L is a linking group, B is a fullerene, and the compound is soluble in water.
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