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n4google.
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Subject Item
isa:50110803
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As C1-C4alkyl for R1, R2 and R4, each independently of the others, there come into consideration, for example, methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, tert-butyl or isobutyl, preferably methyl or ethyl, and especially methyl.
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isap:117943179
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isa:50110803