Task: Please answer the following question about the molecule with SMILES C[C@H]1OC[C@]2(c3cc(NC(=O)c4cnc(C(F)F)cn4)ccc3F)N=C(N)SC[C@H]12.
Question: Please describe this drug.
Answer: Elenbecestat is under investigation in clinical trial NCT02956486 (A 24-Month Study to Evaluate the Efficacy and Safety of Elenbecestat (E2609) in Subjects With Early Alzheimer's Disease).
Task: Please answer the following question about the molecule with {SMILES__description} {SMILES#}.
{#Description|Question|Request!}: {quest#}
{#Result|Answer|Completion!}: {answ#}
C[C@H]1OC[C@]2(c3cc(NC(=O)c4cnc(C(F)F)cn4)ccc3F)N=C(N)SC[C@H]12
C[C@@H]1[C@H]2CSC(=N[C@]2(CO1)C3=C(C=CC(=C3)NC(=O)C4=NC=C(N=C4)C(F)F)F)N
N-[3-[(4aS,5R,7aS)-2-amino-5-methyl-4,4a,5,7-tetrahydrofuro[3,4-d][1,3]thiazin-7a-yl]-4-fluorophenyl]-5-(difluoromethyl)pyrazine-2-carboxamide
Please describe this drug.