4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid, 3,3-dimethyl-7-oxo-6-[(phenylacetyl)amino]- [2S-(2α,5α,6β)]-, compd. with [R-(R*,S*)]-α-[1-(methylamino)ethyl]benzenemethanol (1:1)