prov:value
| - Guanidino groups may be protected by a suitable protecting group, such as nitro, p-toluenesulfonyl (Tos), Z, pentamethylchromanesulfonyl (Pmc), adamantyloxycarbonyl, 2,2,4,6,7-pentamethyldihydrobenzofuran-5-sulfonyl (Pbf), 4-methoxy-2,3,6-trimethylbenzenesulfonyl (Mtr), and Boc.
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