Three new dinormonoterpenoid glucosides from pericarps of Myriopteron extensum

•Three new glucosides were isolated from the pericarps of Myriopteron extensum.•Their structures were elucidated by chemical and extensive spectroscopic techniques.•Compounds 1–3 are rare dinormonoterpenoid glucosides and discovered from Asclepiadaceae for the first time.•Glucosides 1–3 were evaluated for their cytotoxicity against five human cancer cell lines.