... (b) Mahler, HR; Cordes, E. H. "Biological Chemistry", 2nd ed ... All organic solvent extracts were dried over MgS04 and the solvents were removed in vacuo using a rotary evaporator (water aspirator vacuum ... mp 88-89 "C; 'H NMR (CDCl,) 6 1.45 (s,9 H, OtC,H,), 2.80 (d, 2 H,J = 6 Hz ...