Chemical Structure of the Spiropyran (SP) Mechanophore and Its Transformation Into the Merocyanine ( (image) National Research Council of Science & Technology Share Print E-Mail Caption Chemical structure of the spiropyran (SP) mechanophore and its transformation into the merocyanine (MC) form. Credit Korea Institue of Science and Technology(KIST) Usage Restrictions The sources of photos and research results from KIST must be specified. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.