Conditional Formula - Multiple Criteria

Ok, i'll do my best to explain this - i'm working on a sensitive document, so i can only post a blank example.
Example.xlsx

I'm trying to make the full document easier for people to see where inputs are required. What i'm looking for here is a formula i can use within the conditional formatting to highlight row 47.
I would like row 47 to highlight if the following are true;
A47 is blank
A46 > 0
S53 > 0 or S54 > 0
N46:N49 does not contain "OS"

That doesn't look to have worked, because with "OS" appearing in N46, the highlight remains

right, i think i've figured out why that doesn't work. It does if OS is the only input, however there may also be numbers in N46:N49 - if there are other entries in then the formula doesn't work as intended.

N46 to N49 should only contain numbers, comas and "OS1" or "OS2". No spaces, no other text.
The other entries should not have any bearing on this highlight. I'm only interested if someone has entered data into the smaller table and not related it in the larger table.

If you look at my example attachment, N52 (where i've input 17) would say OS, and N53 + N54 would be 1 or 2. This is then related in the larger table as OS1 and OS2 (elsewhere in the full document). However there could be data in rows 53 and 54 but not in S53 or S54 - so i only require the highlight if S54 or S54 contain data AND OS1 or OS2 have not been recorded in N46:N49.

Also, not all the rows 46 - 49 will contain data, so not all need to be highlighted. The highlight is simply to show that, they have recorded data in the small table but not related it to data in the large table.