Task: Please generate a SMILES based on the description below.
Description: A molecule that is permeable through the membrane separating circulating blood and extracellular brain fluid.
Result: O=NN(CCCl)C(=O)NCCCl
Task: Please {#give me|create|generate!} a {#molecule |!}{SMILES__description} based on the {#text |!}description{# below|!}.
Description: A molecule that is {p_np#not &NULL}{p_np__names__adjective}.
Result: {SMILES#}
O=NN(CCCl)C(=O)NCCCl
O=NN(CCCl)C(=O)NCCCl
1,3-bis(2-chloroethyl)-1-nitrosourea