@Test
public void test3DSim2() throws Exception {

    IAtomContainer ac1 = loadMolecule("data/mdl/sim3d1.sdf");
    IAtomContainer ac2 = loadMolecule("data/mdl/sim3d2.sdf");
    float sim = DistanceMoment.calculate(ac1, ac2);
    Assert.assertEquals(0.24962, sim, 0.00001);
}