Munster's unbeaten start to the BKT United Rugby Championship is over after an inspired second-half comeback from Ulster saw the northern province win a thrilling Interpro at Kingspan Stadium.Dan McFarland's side had been left frustrated after blowing a 17-point lead away to Connacht last week at the Sportsground, but this week it was their turn to come from behind, claiming a 21-14 win having trailed 14-3 at one stage in the opening half.While some of Ulster's comeback can be credited to their strength off the bench, with Iain Henderson, Rob Herring and debutant Scott Wilson all making significant contributions in the second half, it was flanker David McCann who carried this win.The 23-year-old was a constant presence in defence and at the breakdown, while he picked off two Munster lineouts in quick succession during the second half as his side dominated the second 40.Munster had started the game brilliantly, winning three early scrum penalties to set up Craig Casey's try inside the first 10 minutes, and the Munster scrum-half was his side's standout player, adding a second try midway through the second half.Ulster had been second best in that first half, but stayed in touch with a try from Jacob Stockdale and a penalty from Nathan Doak.The Ulster scrum-half ended the night with 11 points, drawing his side level with a pair of penalties as they gained full control of the game in the second half, before converting Nick Timoney's winning try on 67 minutes, as the home side got back on track following last week's tough loss in Galway.With Ulster shorn of three tighthead props, Munster were expected to have the edge at the scrum, and that proved true right from the start.Rowntree's side earned field position with a scrum