2,3,4,5,7,9,13,13A-OCTAHYDRO-8-METHOXY-7,9-DIOXO-2,5-METHANOPYRIDO(1',2':4,5)PYRAZINO(2,1-B)(1,3)OXAZEPINE-10-CARBOXYLIC ACID LITHIUM SALT, (2R,5S,13AR)-
2,3,4,5,7,9,13,13a-octahydro-8-methoxy-7,9-dioxo-2,5-methanopyrido(1',2':4,5)pyrazino(2,1-b)(1,3)oxazepine-10-carboxylic acid lithium salt, (2r,5s,13ar)-