(A) Structures of osmium-carbonyl conjugated fatty acid 33 and phosphatidylcholine 34. (B) IR spectra of untreated (bottom), 33 treated (middle) and 34 treated (top) HL60 mucosa cells. The Os-CO stretching vibrations are highlighted by red box. (C) Optical image of HL60 mucosa cells treated with 33. False color IR imaging of HL60 mucosa cells treated with 33. Figure 8b and 8c were reproduced from ref [150]. with permission from American Chemical Society.