The molecule is a monocarboxylic acid anion that is the conjugate base of steviol, obtained by deprotonation of the carboxy group. It is a conjugate base of a steviol.
(1R,4S,5R,9S,10R,13S)-13-hydroxy-5,9-dimethyl-14-methylidenetetracyclo[11.2.1.01,10.04,9]hexadecane-5-carboxylate