| http://www.w3.org/ns/prov#value | - Among these blocking groups, particularly preferable are blocking groups which have two electrophilic groups and react with bi-nucleophilic agents, as described in JP-A-2-296240 (U.S. Pat. No. 5,019,492), JP-A-4-177243, JP-A-4-177244, JP-A-4-177245, JP-A-4-177246, JP-A-4-177247, JP-A-4-177248, JP-A-4-177249, JP-A-4-179948, JP-A-4-184337, and JP-A-4-184338, WO92/21064, JP-A-4-330438, WO93/03419, JP
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