What is the product formed in the reaction of dimedone and benzaldehyde? I'm having a hard time deducing the structure of the product formed when dimedone and benzaldehyde react in the presence of catalytic piperidine. I think that a Knoevenagel reaction will get me to this product:

 

but the answer says that the product has a molar mass of 368 g/mol. The product above is only 246 g/mol. What else can have occurred?
This  image  should  help  you: