in an attempt to alleviate the pain of 14 patients with postherpetic neuralgia , capsaicin ( trans-8-methyl-n-vanillyl-6-nonenamide ) , known to deplete substance p , was applied topically to painful areas of skin for 4 weeks .
C0030193
pain
C0006931
8-methyl-n-vanillyl-6-nonenamide