>1yls_A mol:na length:11 RNA Diels-Alder ribozyme GGAGCUCGCCC >1yls_C mol:na length:11 RNA Diels-Alder ribozyme GGAGCUCGCCC >1yls_D mol:na length:38 RNA Diels-Alder ribozyme GGGCGAGGCCGUGCCGGCUCUUCGGAGCAAUACUCGGC >1yls_B mol:na length:38 RNA Diels-Alder ribozyme GGGCGAGGCCGUGCCGGCUCUUCGGAGCAAUACUCGGC >1yls_D mol:na length:38 RNA Diels-Alder ribozyme GGGCGAGGCCGUGCCGGCUCUUCGGAGCAAUACUCGGC