S3 1 H NMR and 13 C NMR spectra of S-alkylisothiourea 5a S4 1 H NMR and 13 C NMR spectra of S-alkylisothiourea 5b S5 1 H NMR and 13 C NMR spectra of S-alkylisothiourea 5c S6 1 H NMR and 13 C NMR spectra of S-alkylisothiourea 5d S7
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