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I would like to produce a variant of letter a as shown below

enter image description here

The source is Shoenfield's Mathematical Logic book (first occurrence in p18) and it is used to denote structures. It appears (to me) like a large calligraphic variant of lowercase a. I use \cal A instead, and I have also looked over some other alternatives (e.g. the \frac ones) but I would like to use that precise symbol in my notes if possible.

The results from detexify were not really that useful in this case either:

enter image description here

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This symbol is available from the "curly" variant of the commercial MTPro2 package. See the MTPro2 package homepage for more information.

[Disclaimer: I am in no way affiliated with MTPro2, but it is the only place I know that has the symbol]

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