Stemone is an aroma chemical manufactured by Givaudan, the Swiss manufacturer of flavour and fragrance components for the food and perfume industries.
It was developed to be used as a middle note in perfumery, to evoke the smell of green, leafy, freshly cut grass. The first time I smelt Stemone it indeed gave me a powerful reminder of wet grass. It has a lovely, natural aroma of fresh green grass intermingled with rain or early morning dew, or a damp forest. It’s a very strong aroma chemical that I imagine you would add quite sparingly to a perfume formula.
Givaudan recommends its use with fragrance notes such as lily-of-the-valley, narcissus, mandarin, fig leaves, grapefruit, black currant and tomato. They also say it is “an excellent modifier that strengthens and modernizes green notes.”
If you wanted to create a green leaf accord in your perfume formula, Stemone would prove very useful. It’s also an important aroma chemical to use if re-creating the odor of fig leaf or gardenia.