group of 1 to 15 carbon atoms alternatively r 005 to r 008 taken together may form a ring and in that event at least one of r 005 to r 008 is a divalent hydrocarbon group of 1 to 15 carbon atoms having a carboxyl or hydroxyl group while the remaining r 39 s are independently straight branched or cyclic alkylene groups of 1 to 15 carbon atoms r 009 is a monovalent hydrocarbon group of 3 to 15 carbon atoms containing a u2014 co 2 u2014 partial structure at least one of r 010 to r 013 is a monovalent hydrocarbon group of 2 to 15 carbon atoms containing a u2014 co 2 u2014 partial structure while the remaining r 39 s are independently hydrogen or straight branched or cyclic alkyl groups of 1 to 15 carbon atoms r 010 to r 013 taken together may form a ring and in that event at least one of r 010 to r 013 is a divalent hydrocarbon group of 1 to 15 carbon atoms containing a u2014 co 2 u2014 partial structure while the remaining r 39 s are independently straight branched or cyclic alkylene groups of 1 to 15 carbon atoms r 014 is a polycyclic hydrocarbon group having 7 to 15 carbon atoms or an alkyl group containing a polycyclic hydrocarbon group r 015 is an acid labile group r 016 is hydrogen or methyl r 017 is.