Nebivolol Related Compound A – A mixture of (S)-1-[(R)-6-Fluorochroman-2-yl]-2-({(R)-2-[(S)-6-fluorochroman-2-yl]-2-hydroxyethyl}amino)ethanol Hydrochloride, (R,1S,1’S)-2,2′-Azanediylbis{1-[(R)-6-fluorochroman-2-yl]ethanol} Hydrochloride and (S,1R,1’R)-2,2′-Azanediylbis{1-[(S)- 6-fluorochroman-2-yl]ethanol} Hydrochloride