. 2017 Oct 4;11:98. doi: 10.1186/s13065-017-0332-y
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Fig. 6.
1H NMR spectrum of LLp-1a (a), LLp-1b (b), LLp-2 (c) and LLp-3 (d), 13C NMR spectrum of LLp-3 (e)