326
MAURICE WELSCH
TABLE VI (Continued)
Substitution on carbon number:
Antibiotic
Producing microorganisms
2
3
4
5
6
Physodic acid Parmelia physodes, P.
—
—
OH
— CH 2 —CO—C 5 Hn
furfuracea
Protocetraric Parmelia caperata, Ramalina —
CHO
OH
— CH 3
acid
farinacea, etc.
Psoromic acid Psoroma crassum, Alectoria —
CHO
OH
—
CH 3
zopfi
Salazinic acid Parmelia cetrata, P. conspersa, —
CHO
OH
— CH 3
P. marmariza, P. saxatilis,
P. abyssinica
Nidulin
Aspergillus nidulans
—
CI
OH
CI CH 3
Nornidulin
Aspergillus nidulans
—
CI
OH
CI CH 3
Dechlornidulin Aspergillus nidulans
—
OH
CI CH 3
quinone pigments skyrin, luteoskyrin, and iridoskyrin, from P. ishndicum, which appear to derive directly from a common nonaromatic
precursor.
O
O
p
Ο
OH
OH Ο
Nucleus of protoactinorhodin
(CXLV)