After you remove the padding, you end up with a combination of g, c, a and u. The padding is mostly the qwerty keyboard added in it, though since it's a german one it's actually qwertz one.
My ideas were the following.
Idea 1) Assume that g and c are 0, while a and u are 1, then convert the binary to ascii. Didn't get anything useful, and neither did I by changing 0s and 1s.
Idea 2) Since the code is an alphanumeric one, that means that if it is binary, then it would be numbers from 32 to 127, so if a binary octet started with 1, I would add a 0 in the beginning, while if it started with a 0 I'd leave it as is. That gave me an 18 character text, which contained 2 special characters '&' and '(' if I recall correctly. The other 16 characters seemed like a code, but it wasn't one unfortunately.
Idea 3) Assume the pairs weren't g+c, a+u but another combination. Still didn't get anything.
Idea 4) Assume that instead of each character being a 0 or a 1, you use pair of characters, if the pair was an RNA pair, value was 1, else value was 0. That gave me way too few characters for a code.
So, those were what I tried, but still didn't manage anything, and since we are currently about 30 hours from the code's post, I do feel like sharing my tries.