Craig Robins collected paintings by Marlene Dumas. Dumas circulated to art galleries a list of people who were not allowed to by her paintings. Because Robins had sold one of her paintings, his name was on the list. David Zwirner had told Dumas of the sale. Robins wanted to sue Zwirner, but the two orally agreed that instead Zwirner would give Robins "first choice, after museums, to purchase" Dumas's works whenever Dumas had an exhibition at his gallery and to remove Robins's name from Dumas's blacklist. Five years later, Zwirner had a Dumas exhibition but refused to sell to Robins three paintings he wanted to buy, each priced at more than $1 million. Robins sued for breach of contract. Can he recover?