S1 Supporting Information Redox Sensitive Self-Assembling Dipeptide for Sustained Intracellular Drug Delivery Sameer Dhawan, a Sukanya Ghosh, b R. Ravinder, c Sachendra S. Bais, d Soumen Basak, d N. M. Anoop Krishnan, c,e Manish Agarwal, f Manidipa Banerjee* ,b and V. Haridas* ,a a Department of Chemistry, Indian Institute of Technology Delhi, New Delhi, India. b Kusuma School of Biological Sciences, Indian Institute of Technology Delhi, New Delhi, India. c Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi, India. d National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi, India. e Department of Material Science & Engineering, Indian Institute of Technology Delhi, New Delhi, India. f Computer Service Center, Indian Institute of Technology Delhi, New Delhi, India.  Corresponding authors: E-mail: haridasv@chemistry.iitd.ac.in Tel.: +91-11-2659 1380 E-mail: mbanarjee@bioschool.iitd.ac.in Tel.: +91-11-2659 7538