Resiniferatoxin (also known as Reciniferatoxin, Lopain, (+)-resiniferatoxin, Mtx-071, MTX-71, 6,7-Deepoxy-6,7-didehydro-5-deoxy-21-dephenyl-21-(phenylmethyl)daphnetoxin 20-(3-hydroxy-5-methoxybenzeneacetate), Benzeneacetic acid, 4-hydroxy-3-methoxy-, ((2S,3aR,3bS,6aR,9aR,9bR,10R,11aR)-3a,3b,6,6a,9a,10,11,11a-octahydro-6a-hydroxy-8,10-dimethyl-11a-(1-methylethenyl)-7-oxo-2-(phenylmethyl)-7H-2,9b-epoxyazuleno(5,4-e)-1,3-benzodioxol-5-yl)methyl ester, [(2S,3aR,3bS,6aR,9aR,9bR,10R,11aR)-2-benzyl-6a-hydroxy-8,10-dimethyl-7-oxo-11a-(prop-1-en-2-yl)-3a,6,6a,7,9a,10,11,11a-octahydro-3bH-2,9b-epoxyazuleno[4',5':5,6]benzo[1,2-d][1,3]dioxol-5-yl]methyl (4-hydroxy-3-methoxyphenyl)acetate, Neuroclastin or ((1R,2R,6R,10S,11R,15R,17R)-13-benzyl-6-hydroxy-4,17-dimethyl-5-oxo-15-(prop-1-en-2-yl)-12,14,18-trioxapentacyclo(11.4.1.01,10.02,6.011,15)octadeca-3,8-dien-8-yl)methyl 2-(4-hydroxy-3-methoxyphenyl)acetate) is a substance of the carboxylic acid class.