NMR reassignment of stictic acid isolated from a Sumatran lichen Stereocaulon montagneanum (Stereocaulaceae) with superoxide anion scavenging activities - Ismed, F; Dévéhat, F L; Rouaud, I; Ferron, S; Bakhtiar, A; Boustie, J (Z Naturforsch C J Biosci, 2017)