not a chiasm, but

further on Matthew 22.34-46 and the Shema - the parallel structures:

A Pharisees together (34)
        B Pharisees question Jesus (35-36)
                C1 Jesus Answers (37-38)
                C2 Jesus Answers (39-40)

A' Pharisees together (41a)
        B'1 Jesus questions Pharisees (41b-42a)
                C' Pharisees answer (42b)
        B'2 Jesus questions Pharisees (43-45)