something dumb on bibtex entry format,

Mike Marchywka marchywka at
Tue Jan 12 16:58:09 CET 2021

I'm finally moving my bibtex scraping script to c++ and cleaning up a lot
of stuff. I validate a foreign or scraped bibtex entry using latex run on
a test document and my own parser. Its unlikely my parser conforms to 
bibtex requirements exactly so I want to do both. I found what appears
to be an old test case and it still does not make sense. The question
seems to be about backslashes preceding a terminating right brace.
Sometimes they are ok, others not. The test files are xxx.tex and xxx.bib
as shown below.  If I put a backslash on the "month" line before the right brace
it seems to work ( originally there was an abstract entry with the problem but
I deleted it for space and clarity ), 
    month = {2015-09-08 00:00:00 \},

However, doing it on the publisher line fails,

    publisher = {John Wiley \& Sons, Ltd \},

 cat /tmp/xxx.tex
marchywka at happy:/home/documents/cpp/proj/toobib/junk$ cat /tmp/xxx.bib
% programmatically fixed probably bu toobib
% loaded from bbb written on 2019-11-02:17:33:45
%0 prior 0
    address = {Boston, MA, USA},
    author = {Silva, J. C. and Aroso, I. M. and Mano, F. and S{\'a}-Nogueira, I. and Barreiros, S. and Reis, R. L. and Paiva, A. and Duarte, A. R. C.},
    doi = {10.1089/ten.tea.2015.5000.abstracts},
    journal = {Tissue Engineering Part A},
    keywords = {Drug delivery systems, green chemistry, Therapeutic deep eutectic solvents},
    month = {2015-09-08 00:00:00 },
    publisher = {John Wiley \& Sons, Ltd },
    title = { Therapeutic deep eutectic solvents as solubility enhancers fordifferent active pharmaceutical ingredients},
    url = {},
    year = {2015}
marchywka at happy:/home/documents/cpp/proj/toobib/junk$ 

I run 3 times, latex, bibtex, and latex again, then grep for error, output, and warning
giving the following lines in the two cases, 

No pages of output .
Warning - - empty booktitle in 18538
( There was 1 warning )
. / xxx . bbl : 9 : = = > Fatal error occurred , no output PDF file produced !


=No pages of output .
Warning - - empty booktitle in 18538
( There was 1 warning )
LaTeX Warning : Label ( s ) may have changed . Rerun to get cross - references right .
Output written on xxx . pdf ( 1 page , 28937 bytes ) .

What is the backslash before the brace supposed to do or is there something silly I'm
missing? Thanks.

note new address
 Mike Marchywka 306 Charles Cox Drive Canton, GA 30115
 2295 Collinworth  Drive Marietta GA 30062.  formerly 487 Salem Woods Drive Marietta GA 30067 404-788-1216 (C)<- leave message 989-348-4796 (P)<- emergency

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