diff --git a/prody/database/dali.py b/prody/database/dali.py
index a36976fd4..4108c18bf 100644
--- a/prody/database/dali.py
+++ b/prody/database/dali.py
@@ -539,7 +539,7 @@ def daliFilterMultimer(atoms, dali_rec, n_chains=None, reverse=False):
     if not isinstance(dali_rec, DaliRecord):
         raise TypeError("dali_rec should be a DaliRecord")
     try:
-        keys = dali_rec._alignPDB
+        _ = dali_rec._alignPDB
     except:
         raise AttributeError("Dali Record does not have any data yet. Please run fetch.")
 
@@ -551,7 +551,7 @@ def daliFilterMultimer(atoms, dali_rec, n_chains=None, reverse=False):
 
     numChains = 0
     atommap = None
-    for i, chain in enumerate(atoms.iterChains()):
+    for chain in atoms.iterChains():
         m = dali_rec.getMapping(chain.getTitle()[:4] + chain.getChid())
         if m is not None:
             numChains += 1
diff --git a/prody/ensemble/functions.py b/prody/ensemble/functions.py
index ffa7d9c97..ee4c7dde7 100644
--- a/prody/ensemble/functions.py
+++ b/prody/ensemble/functions.py
@@ -515,7 +515,7 @@ def buildPDBEnsemble(atomics, ref=None, title='Unknown', labels=None, atommaps=N
 
         # find the mapping of chains of atoms to those of target
         debug[labels[i]] = {}
-        atommaps_ = alignChains(atoms, target, debug=debug[labels[i]], **kwargs)
+        atommaps_ = alignChains(atoms, target, debug=debug[labels[i]], label=labels[i], **kwargs)
 
         if len(atommaps_) == 0:
             unmapped.append(labels[i])
diff --git a/prody/proteins/compare.py b/prody/proteins/compare.py
index a287ef921..27835c596 100644
--- a/prody/proteins/compare.py
+++ b/prody/proteins/compare.py
@@ -968,6 +968,7 @@ def mapChainOntoChain(mobile, target, **kwargs):
     coverage = kwargs.get('coverage', coverage) 
     pwalign = kwargs.get('pwalign', 'auto')
     pwalign = kwargs.get('mapping', pwalign)
+    label = kwargs.get('label', None)
     alignment = None
 
     if isinstance(pwalign, basestring):
@@ -1044,7 +1045,7 @@ def mapChainOntoChain(mobile, target, **kwargs):
                 result = getAlignedMapping(simple_target, simple_mobile)
             else:
                 if isinstance(alignment, dict):
-                    result = getDictMapping(simple_target, simple_mobile, alignment)
+                    result = getDictMapping(simple_target, simple_mobile, alignment, label)
                 else:
                     result = getAlignedMapping(simple_target, simple_mobile, alignment)
 
@@ -1284,17 +1285,21 @@ def getTrivialMapping(target, chain):
 
     return target_list, chain_list, n_match, n_mapped
 
-def getDictMapping(target, chain, map_dict):
+def getDictMapping(target, chain, map_dict, label=None):
     """Returns lists of matching residues (based on *map_dict*)."""
 
-    pdbid = chain._chain.getTitle()[:4].lower()
-    chid = chain._chain.getChid().upper()
-    key = pdbid + chid
-
-    mapping = map_dict.get(key)
-    if mapping is None:
-        LOGGER.warn('map_dict does not have the mapping for {0}'.format(key))
-        return None
+    try:
+        key = label
+        mapping = map_dict[key]
+    except KeyError:
+        try:
+            pdbid = chain._chain.getTitle()[:4].lower()
+            chid = chain._chain.getChid().upper()
+            key = pdbid + chid
+            mapping = map_dict[key]
+        except KeyError:
+            LOGGER.warn('map_dict does not have the mapping for {0}'.format(key))
+            return None
 
     tar_indices = mapping[0]
     chn_indices = mapping[1]
@@ -1312,13 +1317,13 @@ def getDictMapping(target, chain, map_dict):
             try:
                 n = index(tar_indices, i)
             except IndexError:
-                LOGGER.warn('\nthe number of residues in the map_dict ({0} residues) is inconsistent with {2} ({1} residues)'
+                LOGGER.warn('the number of residues in the map_dict ({0} residues) is inconsistent with {2} ({1} residues)'
                             .format(max(tar_indices)+1, len(chain_res_list), target.getTitle()))
                 return None
             try:
                 b = chain_res_list[chn_indices[n]]
             except IndexError:
-                LOGGER.warn('\nthe number of residues in the map_dict ({0} residues) is inconsistent with {2} ({1} residues)'
+                LOGGER.warn('the number of residues in the map_dict ({0} residues) is inconsistent with {2} ({1} residues)'
                             .format(max(chn_indices)+1, len(chain_res_list), chain.getTitle()))
                 return None
             bres = b.getResidue()