The Pune-based CSIR National Chemical Laboratory (CSIR-NCL), has come up with an anti-tuberculosis (anti-TB) cocrystal drug with improved stability. The research work done by professor AK Nangia and his team at the CSIR-NCL and the School of Chemistry, University of Hyderabad, has cleared the way for development of a stable formulation of 4-FDC (4 drugs fixed dose combination) for curing TB.