NC-17 rating for this flick?

According to Box Office Mojo, this was the only movie rated NC-17 for 2015, yet it is not listed in CARA (movie ratings per the MPAA) or listed in IMDB as having that rating. The running times for the movies on IMDB and B.O.M. are the same and in the second it is also listed as a foreign film genre, so I'm guessing it has to be the same. Does anyone know? Was it given an NC-17 then released unrated? I would think if if was in their site as NC-17 it would have had to be put out in the theater with that rating (rare as that may be today, sad to say). Thank you to anyone with knowledge about this!