Adrenaline is air and light sensitive and forms dark products during decomposition.
Adrenaline L-adrenaline has some important biological functions. On the one hand, it belongs, like the chemically related noradrenaline, to the family of adrenal medulla hormones. On the other hand, adrenaline is a neurotransmitter of the adrenergic nervous system. It was the first hormone which could be crystallized. The structure determination by Jowett and the first total chemical synthesis by Stolz were achieved in 1904.