| http://www.w3.org/ns/prov#value | - Particular preference is given to compounds of the formula I in which two or three, especially two of the radicals R1, R2 and R3 are identical or different groups SO3 .sup.??? M.sup.??? or SO2 NR4 R5 and at the same time X is hydrogen, Y is hydrogen and n is 0.
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