ftpc.connect("ftp.ncbi.nlm.nih.gov");
ftpc.login("anonymous", emailAddress);
ftpc.changeWorkingDirectory("/pubchem/Compound/CURRENT-Full/SDF/");
String [] names = ftpc.listNames();
ftpc.disconnect();
for(int i=0;i<names.length;i++) {
System.out.println(names[i]);
File outFile = new File(pcDir, names[i]);
if(outFile.exists()) continue;