Androsterone
Sorry, this answer is incorrect. Androsterone is a steroid hormone and also a pheromone only found in humans. It has weak androgenic activity and it is synthesized from testosterone in the liver. It reinforces and enhances masculine characteristics in humans. Mammalian pheromones even if not consciously smelled can wield their subconscious effect, such as sexual attraction or mother child bonding. The most common human pheromones are androstenone, androstenol, androsterone, and copulines.