Isolation, stereochemical assignments and molecular mechanics calculation of ethyl β-l-arabinopyranoside

Ethyl β-l-arabinopyranoside (1) was isolated from the roots of Hibiscus rosa-sinensis L. as a natural monoglycoside. Its structure elucidation and unequivocal NMR signals assignments were achieved by a combination of DQF-COSY, HOHAHA, HMQC, and 1J(C,H), HMBC experiments with the aid of molecular mechanics calculations.