5KZnsvrXDcP7JFD7GCuZvifrbcBtK4kAe8nHx6ibktgvPJxs4Lp should be a valid private key. It doesn't include a zero, capital o, capital I or lowercase l.
it is the key for 1nchRAYGJofxyrkuhbL1CGYtD5x8Lowi5 according to blockchain
The checksum doesn't verify though. It's called base58check because it has a checksum.