| http://www.w3.org/ns/prov#value | - to 4, and (i) when m is 0, R1 represents hydrogen, methyl, ethyl, isopropyl, isobutyl, 2-methyl butyl, benzyl, 4-amino butyl, 3-guanidino propyl, 2-methylthio ethyl, carboxymethyl or 2-carboxyethyl, and (ii) when m is a whole number from 1 to 4, R1 represents hydrogen or lower alkyl having 1-5 carbon atoms, and the salts of the compound of formula I.
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