Back-annotation for PrimeTime and power compiler in Synopsys

[Lee]

Hi,

When I do back-annotation for static timimg analysis and power
analysis in PrimeTime and power compiler of Synopsys, I want to
place&route in Silicon Ensemble. My question is,

1. I can extract parasistics in Silicon Ensemble after place&route,
right?

2. After place&route, do I need to do DRC&LVS in Virtuoso?If not, the
parasistics extracted maybe contain some errors, since we are not sure
if the route&place does good work. If I need, how can I do it?Can I
extract parasistics in Virtuoso?

Don't blame me if my question is a little stupid

Thanks for your patience,