OK, it didn't work and I'm not sure why. I'll include more of a sample so you can see where it did work and where it didn't.
The first formula you wrote returned a blank cell and the second worked sometimes but started midway into the string on others.
Ablative liners, thrust or combustion chambers ............................................. 9A106.a, 9A619.c, .e Returned: A106.a, 9A619.c, .e Need to Return: 9A106.a, 9A619.c, .e
Abrin ................................................................................................................................. 1C351.d.1 Returned: C351.d.1 Need to Return: 1C351.d.1
Absolute reflectance measurement equipment .................................................................... 6B004.a Returned: 04.a Need to Return: 6B004.a
Absorbers of electromagnetic waves ...................................................................................... 1C001 Returned: 1C001 Need to Return: 1C001
Absorbers, hair type ............................................................................................... 1C001.a Note 1.a Returned: 1C001.a Note 1.a Need to Return: 1C001.a Note 1.a
There is not always spaces between the "..." and the suffix.