21 C.F.R. § 201.115
A new drug shall be exempt from section 502(f)(1) of the act:
(b) If no application under section 505 or 512 of the act is approved and no request for addition to the index is granted under section 572 with respect to such drug but it complies with section 505(i), 512(j), or 572(g) of the act and regulations thereunder.
No exemption shall apply to any other drug which would be a new drug if its labeling bore representations for its intended uses.
[40 FR 13998, Mar. 27, 1975, as amended at 72 FR 69119, Dec. 6, 2007]