Structure of methyl 6-deoxy- 6-N-dimethyl-N-cyclopentylamonium-2,3-di-O-tetradecyl-α-D-glucopyranoside (1) methyl 6-deoxy-6-amino-2,3-di-O-tetradecyl-α-D-glucopyranoside (2), N-(3,4-bis-tetradecyloxy-benzyl)-N-cyclopentyl-N,N-dimethylammonium (3), and methyl 6-deoxy-6-methoxyamino-2,3-di-O-tetradecyl-α-D-glucopyranoside (4).