A new morphinane alkaloid named as mecoquitupline was isolated from Meconopsis quintuplinervia Regel. Its structure was elucidated to be 6-methoxy-17-methyl-2,3-[methylene bis(oxy)]-morphinan-5-en-7-one by spectroscopic techniques. A new morphinane alkaloid named as mecoquitupline was isolated from Meconopsis quintuplinervia Regel. Its structure was elucidated to be 6-methoxy-17-methyl-2,3- [methylene bis (oxy)] - morphinan-5-en-7-one by spectroscopic techniques.