Typical groups Sp′ are, for example, —p—, —q—CH2CH2—, —CH2CH2—S—CH2CH2— or —CH2CH2—NH—CH2CH2— or —p—, with p being an integer from 2 to 12, q being an integer from 1 to 3 and {HEAD ~ R0} and {TAIL ~ R00} having the meanings given above 
Typical groups Sp′ are , for example , — p — , — q — CH2CH2 — , — CH2CH2 — S — CH2CH2 — or — CH2CH2 — NH — CH2CH2 — or — p — , with p being an integer from 2 to 12 , q being an integer from 1 to 3 and { HEAD ~ R0 } and { TAIL ~ R00 } having the meanings given above
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