The substance was synthesized from P-hydroxybenzoic acid through three steps.
该物质以对羟基苯甲酸为原料，经三步合成。
2
Like cayenne pepper, it has the ability to deplete nerve cells of substancep, a chemical that transmits pain signals to the brain, when used externally.
就像辣椒一样，外用时能消耗传送疼痛信号到大脑的神经细胞中一种称为P物质的化学物质。
3
Over time, it short-circuits pain by depleting nerve cells of a chemical called substancep, which helps transfer pain signals along nerve endings to the brain.