[zyu2ranger]

Hello. I am struggling with a problem. I have attached it. I cannot rationalize a reasonable mechanism for the transformation of the reactant to the production shown. The initial problem is given at the top of the image. Thank you for any assistance.

I have tried to protonate the -OH group and then have an enol kick out the water to form a carbocation; I've tried to make the enol at the top of the right ring make a 1,3-dicarbonyl and close the ring on the carbon adjacent to the initial OH group... none of these are working. Please assist! Thank you in advance.

[kriggy]

Forming the enol seems like a good idea but I dont see how it could kick the water. Something else leaves. Maybe try numering the atoms and figure out where they end up