TY - RPRT TI - Combinatorial discovery of two-photon photoremovable protecting groups. AU - Michael C Pirrung AU - Wolfgang H Pieper AU - Krishna P Kaliappan AU - Mugunthu R Dhananjeyan PY - 2003 DO - 10.1073/pnas.2131115100 UR - https://pubmed.ncbi.nlm.nih.gov/14557545/ ID - 14557545 ER -