instruction:
Translate the given Spanish text to English
question:
If said default PIN is correct, the registration procedure is successful.
answer:
Si el NIP por omisión es correcto el procedimiento de registro es exitoso.


question:
Such additives provide improved combustion characteristics.
answer:
Los aditivos proporcionan características de combustión mejoradas.


question:
?-opioid modulators.
answer:

(ver formula (I)).