| http://www.w3.org/ns/prov#value | - p is an integer from 0 to 6; q is an integer from 0 to 2, or their addition salts with pharmaceutically acceptable mineral or organic acids, with the exclusion of compounds of general formula I wherein R1 represents then radical alkyle, alkenyle or benzyle, R2 an optionally substituted benzyloxy and R3 aralkyle. 2.
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