Patent ID: 7915254

Claim:
A method of antimicrobial photodynamic therapy in a patient in need of antimicrobial photodynamic therapy, which method comprises applying to ar area of a patient in need of antimicrobial photodynamic therapy to be treated an effective amount of a compound of formula wherein R 1 , R 2 , R 3 and R 4 each represent n-propyl; R 1 , R 2 , R 3 and R 4 each represent n-butyl; R 1 , R 2 , R 3 and R 4 each represent n-pentyl; R 1 , R 2 , R 3 and R 4 each represent iso-pentyl; R 1 represents n-butyl, R 2 represents n-butyl, R 3 represents n-propyl and R 4 represents n-propyl; R 1 represents n-hexyl, R 2 represents n-hexyl, R 3 represents n-propyl and R 4 represents n-propyl; R 1 , R 2 , R 3 and R 4 each represent iso-butyl; R 1 represents n-butyl, R 2 represents n-butyl, R 3 represents iso-pentyl and R 4 represents iso-pentyl; R 1 represents ethyl, R 2 represents ethyl, R 3 represents n-propyl and R 4 represents n-propyl; R 1 represents n-pentyl, R 2 represents n-pentyl, R 3 n-propyl, R 4 represents n-propyl; R 1 represents n-butyl, R 2 represents n-butyl, R 3 represents n-pentyl and R 4 represents n-pentyl; R 1 represents ethyl, R 2 represents cyclohexyl, R 3 represents ethyl and R 4 represents cyclohexyl; R 1 methyl, R 2 represents methyl, R 3 represents n-propyl, R 4 represents n-propyl; and R 1 represents ethyl, R 2 represents ethyl, R 3 represents n-heptyl and R 4 represents n-heptyl; and wherein X p− is a counteranion and P is 1, 2, or 3 ; and exposing said area of said patient to light to activate the compound and to thereby effect said antimicrobial photodynamic therapy.