Theravance Biopharma Inc. inked a definitive agreement with Royalty Pharma potentially worth more than $1.5 billion to sell through a subsidiary, Theravance Respiratory Co. LLC, its 85% interest in royalty rights to Trelegy Ellipta (fluticasone furoate/umeclidinium/vilanterol, GSK plc), a once-daily, single-inhaler triple therapy for chronic obstructive pulmonary disease and asthma.