Resources:
  Bucket:
    Type: AWS::S3::Bucket
    Properties:
      BucketName:
        !Sub
        - "${Region}-foo-${!Immediate}-foo-${AnotherBucket}-${AnotherBucket.DomainName}-${Name}"
        - Name:
            Ref: AnotherBucket
          Region:
            Fn::Base64: AWS::Region
  AnotherBucket:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: another-bucket