def is_derivatized(monosaccharide):
    """Tests whether any of the substituents attached to `monosaccharide` were
    added by derivatization.

    Parameters
    ----------
    monosaccharide : Monosaccharide
        The object to test

    Returns
    -------
    bool
    """
    for pos, sub in monosaccharide.substituents():
        if sub._derivatize:
            return True
    return False