The term hierarchical structure is identified in base64 scheme by the sequence aGllcmFyY2hpY2FsIHN0cnVjdHVyZQ==, while the MD5 signature is equal to 2d6d8d54d8cd779b27a8ad77445ee699. The ASCII encoding of hierarchical structure in hexadecimal notation is 68696572617263686963616c20737472756374757265.