If any one of the transfers, trusts, interests, rights, or powers enumerated and described in sections
2035 to
2038, inclusive, and section
2041 is made, created, exercised, or relinquished for a consideration in money or money’s worth, but is not a bona fide sale for an adequate and full consideration in money or money’s worth, there shall be included in the gross estate only the excess of the fair market value at the time of death of the property otherwise to be included on account of such transaction, over the value of the consideration received therefor by the decedent.