11. Thus, cycloaddition yields the carboxyl group on C-3 and the phenyl group on C-4 regioselectively. 12. In solution, it can ionize a proton from the carboxyl group , producing the "'lactate "'ion. 13. The Gamt1 and gamt2 genes encode enzymes that methylate the C-6 carboxyl group of GAs. 14. The C-terminal carboxyl group of this toxin is amidated. 15. The amino group is protonated and I'm worried that'll discourage protonation of the carboxyl group . 16. Biotinylation at carboxyl groups occur at pH 4.5 5.5. 17. It has a hydroxyisopropyl group connected to the imidazole ring in addition to the carboxyl group . 18. Compared to Metol, glycin has a carboxyl group attached to the methyl group of the Metol. 19. When ATP is not present, the negative charge of the E501 carboxyl group balances this charge. 20. Its surface is covered with epoxy, hydroxyl, and carboxyl groups that interact with cations and anions.
