def vessel_tip_coupling_data_to_str(data_list):
    """A list of vessel tip data elements is converted into a string."""
    s = []
    for v in data_list:
        s.append('VesselTipData(')
        s.append('  p = Point(x={}, y={}, z={}),'.format(v.p.x, v.p.y, v.p.z))
        s.append('  vertex_id = {},'.format(v.vertex_id))
        s.append('  pressure = {},'.format(v.pressure))
        s.append('  concentration = {},'.format(v.concentration))
        s.append('  R2 = {},'.format(v.R2))
        s.append('  radius_first = {},'.format(v.radius_first))
        s.append('  radius_last = {},'.format(v.radius_last))
        s.append('  level = {}'.format(v.level))
        s.append('),')
    return '\n'.join(s)