Then the RMSDs of bond lengths of 1ti4j, 1vlfj, 1g8ja, 1g8ka related to the Mo4+ ion are in order 0.2158Å, 0.2008Å, 0.1309Å, 0.0238Å. The RMSDs of bond angles of 1ti4j, 1vlfj, 1g8ja, 1g8ka related to the Mo4+ ion are 8.91º, 9.25º, 6.96º, 6.06º, respectively.