def findRxnName(rxnid, reactionsBiGG):
    """
    Retreive (descriptive) name of reaction from BiGG-file.

    Returns
    -------
    String with name (when found), otherwise empty.
    """
    if rxnid in list(reactionsBiGG.index):
        return(str(reactionsBiGG.loc[rxnid]['name']))
    else:
        return(str(''))