human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Season, MLS Reg. Season, MLS Cup Playoffs, U.S. Open Cup, CONCACAF Champions Cup / Champions League
###Question: What were the placements of the team in regular season when they reached quarterfinals in the U.S. Open Cup but did not qualify for the Concaf Champions Cup?
gpt
SELECT MLS Reg. Season FROM table WHERE U.S. Open Cup = Quarterfinals AND CONCACAF Champions Cup / Champions League = Did not qualify