. "Patent US5869715 - Cationic monoamine compound (quaternary ammonium or tertiary amine salt with ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More ??Sign inAdvanced Patent SearchPatentsFor use in transporting biologically active species into and through membrane barriers, a cationic amine compound is utilized that has the general structure: ##STR1## wherein R4 and R5 are a p" . . . .