; and (B) the Secretary shall be deemed to not be an instrumentality of the Government. (2) Accredited investor requirement Securities issued under this Act may only be purchased by accredited investors. (g) Corporation not guaranteed by the United States Except as provided under subsection (e)(1)(A), the full faith and credit of the United States shall not be pledged to the Corporation or any security of the Corporation. (h) Diversification requirement The Corporation shall, during the 3-year period beginning on the date that the Corporation first purchases rights to a rare disease therapeutic, purchase the rights to at least 15 rare disease therapeutics. (i) Authorization of appropriations (1) In general There is authorized to be appropriated to the Secretary $3,000,000 to establish the Corporation and complete the privatization of the Corporation. (2) Repayment of appropriations Not later than the end of the 36-month period beginning on the date the Corporation is privatized pursuant to subsection (c), the Corporation shall reimburse the Government for the amount of any appropriation made pursuant to paragraph (1), plus interest on such amount. (j) Sunset The Corporation shall terminate after the end of the 18-month period following the later of— (1) the date on which the last bond issued under subsection (e) matures