A pair of LifeBrands alums are launching Reagent, a New York medical advertising agency aimed at specialists. The shop, led by Lorraine Pastore, James Street and Maris Schilling, will service small, specialized biotech companies that need marketing advice for early-stage compounds but lack the funds to hire a larger agency. Pastore was previously president of LifeBrands, where Street was EVP, director of scientific affairs, and Schilling’s experience includes stints at KPR and Grey.