Derivative is a 2005 Turkish drama film, written, produced and directed by Ulaş İnaç based on a short story by Miguel de Cervantes, about the complicated relationships between three people who confess their thoughts each evening to the camera for a movie project. The film, which went on nationwide general release across Turkey on November 18, 2005 , won the Golden Orange for Best Film at the 42nd Antalya "Golden Orange" International Film Festival.