Rasathanthram (Malayalam : രസതന്ത്രം, English : Chemistry) is a 2006 Malayalam drama film written and directed by Sathyan Anthikkad, starring Mohanlal and Meera Jasmine in lead roles. Other actors include Bharath Gopi, KPAC Lalitha, Innocent, Oduvil Unnikrishnan and Mamukkoya. Director Sathyan Anthikkad got the Mathrubhumi Best Director award for this film. Music director Ilayaraja scored the music. It completed 150 days run in various centres it released.