Debilosides A–C: Three New Megastigmane Glucosides from Equisetum debile

Debilosides A–C ( 1 – 3 ), three new megastigmane glucosides, were isolated from the whole plant of Equisetum debile, together with the four known constituents blumenol A, corchoinoside C, sammangaoside A, and (3S,5R,6R,7E,9S)‐9‐(β‐D ‐glucopyranosyl)oxy]megastigm‐7‐ene‐3,5,6‐triol ( 4 ). Their structures were elucidated on the basis of in‐depth spectroscopic analyses including 2D‐NMR techniques.