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Figure 3
The basic repeating unit, A; the basic repeating unit with imidazolidine rings omitted, B; the tetranuclear unit, C; a part of the polymer, D. |
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Figure 3
The basic repeating unit, A; the basic repeating unit with imidazolidine rings omitted, B; the tetranuclear unit, C; a part of the polymer, D. |