| http://www.w3.org/ns/prov#value | - R3, R4 and R5 is hydrogen and each of the others independently is lower alkyl containing up to and including 4 carbon atoms, such as ethyl, hydroxy-lower alkyl containing up to and including 4 carbon atoms, such as 2-hydroxyethyl or 2-hydroxypropyl, or together are 4- to 7-membered lower alkylene such as 1,4-butylene or 1,5-pentylene, 4- to 7-membered, optionally N-lower alkylated aza-lower alkyl
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