obtain coefficient from interaction dummies

Dear all ,

I ran this regression:

reg lnmwage totalpers addshift edulength urate vrate i.hlofeduc#c.age i.hlofeduc#c.agesq edusq

Now I want to use nlcom on coefficients of 1.hlofeduc#c.age/2.hlofeduc#c.age

How should I write those coefficients? Thanks in advance.

Best,
Samir