The Stochastic-GAS scheme is conceptually equivalent to a stochastic uncontracted Multi-Reference Configuration Interaction approach with single and double excitations from the occupied space (Stochastic-MRCISD). Clearly, no conventional uncontracted or contracted MRCI procedure can be carried that uses the large CAS (32, 34) reference wave function. In that respect the present calculation is unprecedented and it is only possible using our Stochastic-GAS strategy.