2 amino 3 decylpteridin 4(3h) one 2 4 (decyloxy)pteridin 2 amine 2 Article LUVs 2 alkyl group 2 alkylation 2 comparative study 2 conjugate 2 controlled study 2 drug solubility 2 drug structure 2 drug synthesis fluorescence 2 lipophilic pterins 2 lipophilicity 2 n' (3 decyl 4 oxo 3,4 dihydropteridin 2 yl) n,n dimethylformimidamide 2 n' [4 (decyloxy)pteridin 2 yl] n,n dimethylformimidamide 2 nucleophilicity 2 phospholipid membrane 2 photodegradation 2 photosensitization 2 photosensitizing agent 2 photothermal therapy 2 priority journal pterin 2 pterin derivative 2 quantum yield 2 regioselectivity 2 singlet oxygen 2 substitution reaction 2