| http://www.w3.org/ns/prov#value | - O???, B1 and B2 are identical or different and are 1???4C-alkylene, 1,4-cyclohexylene, 1,3-cyclohexylene, 1,4-phenylene, 1,3-phenylene, 1,4-piperazinylene or 1,4-piperidinylene, K1 is -B3-X1, -B3-Y1 or -B3-Z1-B5-X1, K2 is -B4-X2, -B4-Y2 or -B4-Z2-B6-X2, B3 and B4 are identical or different and are a bond or 1???4C-alkylene, B5 and B6 are identical or different and are a bond or 1???2C-alkylene, X1
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