The term discriminative stimulus is identified in base64 scheme by the sequence ZGlzY3JpbWluYXRpdmUgc3RpbXVsdXM=, while the MD5 signature is equal to 9b8c5ee69a86411c488f076fba7983c5. The ASCII encoding of discriminative stimulus in hexadecimal notation is 6469736372696d696e6174697665207374696d756c7573.