Yeah it’s an e9s. And the QL is the CL566. No e in the stamping.If it's KMC then it should have links with KMC stamped on them, and the neighbouring link the chain model number -> e9 sport - presumably shortened to e9s. You may also want to have a replacement quicklink too, which i think is cl566e.
You will no doubt have to shorten the chain so you'll need a chain breaker tool, as well as chain pliers (you can made do with normal pliers but its a lot easier with the correct tools)
KMC also makes a less expensive, combination quick link plier/tire iron but it is plastic and much thicker and bulkier and does not carry the spare links.I've always carried a chain breaker. This is the first bike I've had with the quick link. I got some extra KMC quick links for mine the other day. I may buy an extra chain in the future just for a spare but I'm just going to carry a couple quick links and the breaker on the bike.
I have an old school version that I’m going to test when I get the chain.The other tool you should have in your road kit is a chain link breaker. If you do break a chain you will have to push the pin out on the other side of the broken link in order to put the quick link in.