Chow test for structural break in 2SLS process

I am using ivregress in STATA 16. I want to understand how can I apply chow test for structural break in this context.

Suppose I run following code

Code:

ivregress gpa  iq age father_edu (gpa_peer = ins1 ins2 ins3),nonconstant robust

then i want test the structural break using class size so i generate following dummy variable

Code:

 gen d2=0
replace d2=1 if class_size > 20

further how can I continue from here to use chow test. In usual ols regression we do

Code:

 d2*gpa_peer d2*iq d2*father_edu

and then use command

Code:

test d2 d2*gpa_peer d2*iq d2*father_edu

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