The term hydrogen carbonate is identified in base64 scheme by the sequence aHlkcm9nZW4gY2FyYm9uYXRl, while the MD5 signature is equal to 7dd1c9294924d6b3bd2e5b126418d0a4. The ASCII encoding of hydrogen carbonate in hexadecimal notation is 687964726f67656e20636172626f6e617465.