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. (B)• . (P) is a repeat- (2) Repeating Umt. .) ntained in the resm p a part or . umt(B co . h droxylgrou ’ h The repeatmg e phenolic y groups eac . t least on 1 group or . f . unit havmg a f the hydroxy . by the act10n o ~~f of hydrogen ato:;riup capable ofleavmg being protected by . unit is useful so far 

an acid. . I (8) any rep~lillg h olic hydroxyl A the repeating u~1 h ; g at least one p en s . umt avm as it is a repeatmg 

