CCL: Querry: Get Ring/Aromatic bonds and atom types information

From: "Gulzar Singh" <gulzar.singh54..gmail.com>
Subject: CCL: Querry: Get Ring/Aromatic bonds and atom types information
Date: Wed, 11 Mar 2015 05:42:10 -0400

 Sent to CCL by: "Gulzar  Singh" [gulzar.singh54- -gmail.com]
 Hi
 I need to get information about rotatable bonds only, from a given structure.
 Basic idea to get this information is to remove rings and other double/triple
 bonds or directly detect rotatable bonds.
 eg: from this N[C(~)(~)H](CC1=CN=CN1)C(O)=O , there are only 3 rotatable bonds
 and one ring.
 But how to get this information computationally?
 Which software/tool/package/algorithm can provide this information along with
 the type of atom (C, N, O etc.) and its position (C1, N3, C4 etc.). Python tool
 is preferred.
 Thank You