Sources say ChemChina is close to finalizing a deal to buy Syngenta for $45 billion.
That's about the same as the offer Monsanto made last year, but Syngenta rejected.
There are a couple of big differences.
ChemChina's bid is all cash. Monsanto's was a combination of cash and shares.
And Monsanto accompanied its bid with plans to sell Syngenta's seed division to avoid anti-trust challenges.