transfer
(2) Income in case of sale, etc. If a right, described in paragraph (1), to receive an amount is transferred by the estate of the decedent or a person who received such right by reason of the death of the decedent or by bequest, devise, or inheritance from the decedent, there shall be included in the gross income of the estate or such person, as the case may be, for the taxable period in which the transfer occurs, the fair market value of such right at the time of such transfer plus the amount by which any consideration for the transfer exceeds such fair market value. For purposes of this paragraph, the term “transfer” includes sale, exchange, or other disposition, or the satisfaction of an installment obligation at other than face value, but does not include transmission at death to the estate of the decedent or a transfer to a person pursuant to the right of such person to receive such amount by reason of the death of the decedent or by bequest, devise, or inheritance from the decedent.