d at least one polyol; or from a diester of a polycarboxylic acid as sole reactant 602 Nitrogen-containing reactant 603 Reactant contains atom other than C, H, or O 604 At least one polyol containing only two -C-OH groups reactant 605 Derived from terephthalic acid or derivative 606 Nitrogen-containing reactant 607 Two or more carboxylic acids or derivatives, or two or more nitrogen containing com